CONCERTS
CONCERTS
Upcoming Concerts
Highlights of the 2026/27 Season
Orchestre National Bordeaux Aquitaine October 2026
Netherlands Radio Philharmonic Orchestra January and April 2027
Bamberger Symphoniker January 2027
Polish National Radio Symphony Orchestra May 2027
More details coming soon!
10th October 2026 · Conducting
Babylon Orchester Berlin
Babylon Kino Berlin
Programme: “Metropolis LIVE”
Original music written for the film by G. Huppertz
11th October 2026 · Conducting
Babylon Orchester Berlin
Babylon Kino Berlin
Programme: “The Circus”
Original music written for the film by Charlie Chaplin
13th – 17th October 2026 · Assisting Stéphane Denève
Netherlands Radio Philharmonic Orchestra
The Royal Concertgebouw Amsterdam
Programme:
Francis Poulenc, The Lady of Monte Carlo
Francis Poulenc, Model Animals
Francis Poulenc, Gloria
Francis Poulenc, Les Dialogues des Carmelites: Prelude (from Act 3, Scene 4)
Francis Poulenc, Les Dialogues des Carmelites: Salve Regina
21st October 2026 · Conducting
Orchestre National Bordeaux Aquitaine
Opéra National de Bordeaux - Grand-Théâtre Salon Boireau
Programme: “The Kid”
Original music written for the film by Charlie Chaplin
22nd October 2026 · Conducting
Orchestre National Bordeaux Aquitaine
Opéra National de Bordeaux - Grand-Théâtre, Salon Boireau
Programme: “The Kid”
Original music written for the film by Charlie Chaplin
27th – 31th October 2026 · Assisting Elena Schwarz
Netherlands Radio Philharmonic Orchestra
The Royal Concertgebouw Amsterdam
Programme:
Aftab Darvishi, In Absence (world premiere)
Witold Lutosławski, Cello Concerto
Witold Lutosławski, Little Suite
Nikolai Rimsky-Korsakov, Scheherazade
10th November 2026 · Conducting
Sächsische Bläserphilharmonie
Stadthalle Belgern
Programme: To be announced
12th – 21th November 2026 · Assisting Giulio Cilona
Netherlands Radio Philharmonic Orchestra and Netherlands Radio Choir
The Royal Concertgebouw Amsterdam
Programme: Louise Bertin, Fausto (opera in 4 acts)
1st – 6th December 2026 · Assisting Karina Canellakis
Netherlands Radio Philharmonic Orchestra
TivoliVredenburg Utrecht
The Royal Concertgebouw Amsterdam
Programme:
Kaija Saariaho, Lumière et pesanteur
Alban Berg, Sieben frühe Lieder
Gustav Mahler, Symphony No. 4
5th January 2027 · Conducting
Netherlands Radio Philharmonic Orchestra
Programme to be announced
12th – 16th January 2027 · Assisting Karina Canellakis
Netherlands Radio Philharmonic Orchestra
The Royal Concertgebouw Amsterdam
Programme:
Maurice Ravel, A Boat on the Ocean
Robin De Raaff, L'azur (Dutch premiere)
Leoš Janáček, Glagolitic Mass
29th January 2027 · Conducting
Bamberger Symphoniker
Bamberg, Konzerthalle
Programme: Family concert – Tchaikovsky, Swan Lake Suite
2nd – 6th February 2027 · Assisting Karina Canellakis
Netherlands Radio Philharmonic Orchestra
The Royal Concertgebouw Amsterdam
Programme:
John Adams, aria "This is prophetic!" from Nixon in China
Samuel Barber, Medea's Dance of Vengeance, Op. 23a
Charles Ives, Three Places in New England (version for large orchestra)
Samuel Barber, Knoxville: Summer of 1915
Igor Stravinsky, Symphony in Three Movements
15th – 20th February 2027 · Assisting James Gaffigan
Netherlands Radio Philharmonic Orchestra
The Royal Concertgebouw Amsterdam
Programme:
Silvestre Revueltas, Sensemayá
Magnus Lindberg, Concerto for 2 Pianos and Orchestra
Igor Stravinsky, The Firebird
3rd March 2027 · Conducting
Landesjugendorchester Sachsen
Kulturfabrik Leipzig e.V.
Programme:
Yannis Constantinidis, Suite Dodecanesienne No. 1
Yannis Constantinidis, “Erini” from Eight Dodecanese Songs for choir
Witold Lutosławski, Little Suite
Zoltán Kodály, Variations on the Hungarian folksong “The Peacock”
4th March 2027 · Conducting
Landesjugendorchester Sachsen
Theater Meißen
Programme:
Yannis Constantinidis, Suite Dodecanesienne No. 1
Yannis Constantinidis, “Erini” from Eight Dodecanese Songs for choir
Witold Lutosławski, Little Suite
Zoltán Kodály, Variations on the Hungarian folksong “The Peacock”
8th April 2027 · Conducting
Netherlands Radio Philharmonic Orchestra
Programme to be announced
20th – 24th April 2027 · Assisting Stéphane Denève
Netherlands Radio Philharmonic Orchestra
The Royal Concertgebouw Amsterdam
Programme:
Andrea Tarrodi, Liguria
Samy Moussa, Violin Concerto 'Adriano'
Ottorino Respighi, Fontane di Roma
Ottorino Respighi, Pines of Rome
9th May 2027 · Conducting
Polish National Radio Symphony Orchestra
NOSPR Concert Hall, Katowice
Programme:
Dora Pejačević, Overture in D minor, op. 49
Ludwig van Beethoven, Piano Concerto No 2 in B-flat major, op 19
Antonín Dvořák, The Wild Dove, op. 110
22nd May 2027 · Conducting
Berlin-Brandenburgisches Sinfonieorchester
Programme to be announced
23rd May 2027 · Conducting
Berlin-Brandenburgisches Sinfonieorchester
Programme to be announced
Previous Concerts
15th – 20th September 2026 · Assisting Karina Canellakis
Netherlands Radio Philharmonic Orchestra
TivoliVredenburg, Utrecht
The Royal Concertgebouw, Amsterdam
Programme:
Antonín Dvořák, Violin Concerto
Zoltán Kodály, Dances from Galanta
John Adams, Harmonium for chorus and orchestra
30th August 2026 · Conducting
Babylon Orchester Berlin
Babylon Kino Berlin
Programme: “Metropolis LIVE”
Original music written for the film by G. Huppertz
5th July 2026 · Conducting
Babylon Orchester Berlin
Babylon Kino Berlin
Programme: “Metropolis LIVE”
Original music written for the film by G. Huppertz
17th May 2026 · Conducting
London Philharmonic Orchestra
Royal Festival Hall
Programme:
W. A. Mozart, Le nozze di Figaro - Overture
Benjamin Britten, “Dawn” from the Four Sea Interludes
Dmitry Kabalevsky, “Comedians” Galop
Paul Rissmann, “Stan and Mabel and the Race for Space”
Ron Graier/Robin Mc Ewan, “Doctor Who” theme
“FUNharmonics” concert series
11th May 2026 · Conducting
Staatsorchester Braunschweig
Staatstheater Braunschweig - Großes Haus
9. Sinfoniekonzert: Klangvolle Pionierinnen
Programme:
Grażyna Bacewicz, Overture
Antonín Dvořák, Cello Concerto
Dora Pejačević, Symphony in f-sharp minor
10th May 2026 · Conducting
Staatsorchester Braunschweig
Staatstheater Braunschweig - Großes Haus
9. Sinfoniekonzert: Klangvolle Pionierinnen
Programme:
Grażyna Bacewicz, Overture
Antonín Dvořák, Cello Concerto
Dora Pejačević, Symphony in f-sharp minor
26th April 2026 · Conducting
Berlin-Brandenburgisches Sinfonieorchester
Emmauskirche Berlin Kreuzberg
Programme:
Lili Boulanger, D’ un matin de printemps
Lili Boulanger, D’ un soir triste
Camille Saint-Saëns, Symphony No. 3
25th April 2026 · Conducting
Berlin-Brandenburgisches Sinfonieorchester
Passionskirche am Marheinekeplatz
Programme:
Lili Boulanger, D’ un matin de printemps
Lili Boulanger, D’ un soir triste
Camille Saint-Saëns, Symphony No. 3
19th April 2026 · Conducting
London Philharmonic Orchestra
Eastbourne, Congress Theatre
Programme:
Florence Price, Andante Moderato for strings
Samuel Barber, Knoxville: Summer of 1915
George Gershwin, selection of songs from Porgy and Bess
Jean Sibelius, Symphony No. 1
6th April 2026 · Conducting
Babylon Orchester Berlin
Babylon Kino Berlin
Programme: “Metropolis LIVE”
Original music written for the film by G. Huppertz
30th March - 1st April 2026 · Assisting Ed Gardner
London Philharmonic Orchestra and London Philharmonic Choir
Royal Festival Hall
Programme:
Mark-Anthony Turnage, Three Screaming Popes
Béla Bartok, Violin Concerto No.1
Modest Mussorgsky, Pictures at an Exhibition (orch Ravel)
11th March 2026 · Conducting
London Philharmonic Orchestra
Royal Festival Hall
Programme:
W. A. Mozart, Le nozze di Figaro - Overture
Benjamin Britten, “Dawn” from the Four Sea Interludes
Dmitry Kabalevsky, “Comedians” Galop
Paul Rissmann, “Stan and Mabel and the Race for Space”
Ron Graier/Robin Mc Ewan, “Doctor Who” theme
“BrightSparks” concert series
8th March 2026 · Conducting
Babylon Orchester Berlin
Babylon Kino Berlin
Programme: “Metropolis LIVE”
Original music written for the film by G. Huppertz
5th-7th February 2026 · Assisting Ed Gardner
London Philharmonic Orchestra and London Philharmonic Choir
Royal Festival Hall
Programme:
Vítězslava Kaprálová, Rustic Suite
Karol Szymanowski Stabat mater
Vítězslava Kaprálová, Waving Farewell
Béla Bartok, The Wooden Prince (complete)
30th January - 4th February 2026 · Assisting Ed Gardner
London Philharmonic Orchestra
Royal Festival Hall
Programme:
Grazyna Bacewicz, Overture
Bohuslav Martinu, Violin Concerto No.2
Witold Lutoslawski, Symphony No.4
Leoš Janacek, Taras Bulba
19th-21st January 2026 · Assisting Vladimir Jurowski
London Philharmonic Orchestra
Royal Festival Hall
Programme:
Anna Korsun, Terricone
Sergei Rachmaninov, Rhapsody on a Theme of Paganini
Alexander Mosolov, The Iron Foundry
Sergei Prokofiev, Symphony No.2
2nd January 2026 · Conducting
Babylon Orchester Berlin
Babylon Kino Berlin
Programme: “Metropolis LIVE”
Original music written for the film by G. Huppertz
10th-20th November 2025 · Assisting Michael Schønwandt
Symphonieorchester der Universität der Künste Berlin
Berliner Philharmonie
Programme:
Britten, Sinfonia da Requiem, op. 20
R. Strauss, Concerto in D major for Oboe and Small Orchestra
R. Strauss, Ein Heldenleben op. 40
23rd-25th October 2025 · Assisting Karina Canellakis
London Philharmonic Orchestra
Royal Festival Hall
Programme:
W. A. Mozart, Idomeno Overture
W. A. Mozart, Masonic Funeral Music
W. A. Mozart, Piano Concerto No.25 in C, K.503
Sergei Rachmaninov, Symphony No.2
20th-22nd October 2025 · Assisting Karina Canellakis
London Philharmonic Orchestra
Royal Festival Hall
Programme:
Lili Boulanger, D’un Matin de printemps
Lili Boulanger, Faust et Hélène
Igor Stravinsky, Rite of Spring (1947)
12th October 2025 · Conducting
Berlin-Brandenburgisches Sinfonieorchester
Emmauskirche Berlin Kreuzberg
Programme:
Schumann, Ouvertüre zur Oper „Genoveva“, op. 81
Mozart, Hornkonzert Nr. 3, KV 447
Brahms, 1. Sinfonie, op. 68
11th October 2025 · Conducting
Berlin-Brandenburgisches Sinfonieorchester
Bürgerhaus Neuenhagen
Programme:
Schumann, Ouvertüre zur Oper „Genoveva“, op. 81
Mozart, Hornkonzert Nr. 3, KV 447
Brahms, 1. Sinfonie, op. 68
1st-3rd October 2025 · Assisting Ed Gardner
London Philharmonic Orchestra
Royal Festival Hall
Programme:
Hans Abrahamsen, Let me tell you
Gustav Mahler, Symphony No. 4
15th September 2025 · Conducting
Sächsische Bläserphilharmonie
Deutsche Bläserakademie Bad Lausick
“Babykonzert”
31st August 2025 · Conducting
Babylon Orchester Berlin
Stadttheater Hildesheim
Programme: “Metropolis LIVE”
Original music written for the film by G. Huppertz
27th August 2025 · Conducting
Sächsische Bläserphilharmonie
Kulturhaus Schweizergarten Wurzen
“Babykonzert”
26th July 2025 · Conducting
Chicago Symphony Orchestra
Bennett Gordon Hall
“A tapas menu with CSO Winds & Strings”
Shared concert with Marin Alsop
10th and 11th May 2025 · Conducting
Babylon Orchester Berlin
Babylon Kino Berlin
Programme: “Alexander Nevsky”
Original music written for the film by Sergei Prokofiev
4th May 2025 · Conducting
Babylon Orchester Berlin
Babylon Kino Berlin
Programme: “Metropolis LIVE”
Original music written for the film by G. Huppertz
13th April 2025 · Conducting
Babylon Orchester Berlin
Babylon Kino Berlin
Programme: “Metropolis LIVE”
Original music written for the film by G. Huppertz
12th April 2025 · Conducting
Babylon Orchester Berlin
Babylon Kino Berlin
Programme: “Nosferatu LIVE”
Original music written for the film by H. Erdmann
5th April 2025 · Conducting
Berlin-Brandenburgisches Sinfonieorchester
Choirs of Berliner Kantorei, Berliner Motettenchor, Berliner Mädchenchor
Konzerthaus Berlin
Programme: Dvorak: Stabat Mater op. 58
31st March 2025 · Conducting
Babylon Orchester Berlin
Babylon Kino Berlin
Programme: “Metropolis LIVE”
Original music written for the film by G. Huppertz
23rd February 2025 · Conducting
Babylon Orchester Berlin
Babylon Kino Berlin
Programme: “Metropolis LIVE”
Original music written for the film by G. Huppertz
18th-22nd February 2025 · Assisting Marin Alsop
Berliner Philharmoniker
Berliner Philharmonie
Programme:
Outi Tarkiainen, Day night day for orchestra (2024)
Brett Dean, Fire Music for Orchestra (2010-2011)
Aaron Copland, Appalachian Spring - Suite for Orchestra
H. Villa-Lobos, Choros No. 10
17th February 2025 · Conducting
Babylon Orchester Berlin
Babylon Kino Berlin
Programme: “Nosferatu LIVE”
Original music written for the film by H. Erdmann
14th February 2025 · Conducting
Babylon Orchester Berlin
Babylon Kino Berlin
Programme: “Metropolis LIVE”
Original music written for the film by G. Huppertz
20th-23rd January 2025 · Assisting Marin Alsop
ORF Vienna Radio Symphony Orchestra
Wiener Konzerthaus
Programme:
Aaron Copland, Appalachian Spring - Suite for Orchestra
Brett Dean, Fire Music for Orchestra (2010-2011)
Sergei Rachmaninoff, Piano Concerto No. 2
3rd January 2025 · Conducting
Babylon Orchester Berlin
Babylon Kino Berlin
Programme: “Metropolis LIVE”
Original music written for the film by G. Huppertz
28th December 2024 · Conducting
Babylon Kino Berlin
Programme: “Nosferatu LIVE”
Original music written for the film by H. Erdmann
Babylon Orchester Berlin
15th December 2024 · Conducting
Babylon Kino Berlin
Programme: “Metropolis LIVE”
Original music written for the film by G. Huppertz
Babylon Orchester Berlin
10th and 17th November 2024 · Conducting
Babylon Kino Berlin
Programme: “Metropolis LIVE”
Original music written for the film by G. Huppertz
Babylon Orchester Berlin
2nd November 2024 · Conducting
Babylon Kino Berlin
Programme: “Nosferatu LIVE”
Original music written for the film by H. Erdmann
Babylon Orchester Berlin
13rd October 2024 · Conducting
Zwinglikirche Friedrichshain, Berlin
Programme:
Mendelssohn, Herbriden-Ouvertüre
Bruch, Violinkonzert in g-moll
Mayer - Sinfonie f-moll
Berlin-Brandenburgisches Sinfonieorchester
12th October 2024 · Conducting
Gustav-Adolf-Kirche Charlottenburg, Berlin
Programme:
Mendelssohn, Herbriden-Ouvertüre
Bruch,Violinkonzert in g-moll
Mayer, Sinfonie f-moll
Berlin-Brandenburgisches Sinfonieorchester
20th September 2024 · Conducting
Orchesterhaus Kriens
Programme:
Bizet/BorneCarmen-Fantasie für Flöte und Orchester
Schumann, Ouvertüre aus Ouvertüre, Scherzo und Finale E-Dur op. 52
Luzerner Sinfonieorchester
14th September 2024 · Conducting
Venue: Bold Tendencies, London
Programme:
Gustav Mahler, Symphony No. 2 “Resurrection”
Philharmonia Orchestra and Philharmonia Chorus
25th August 2024 · Conducting
Babylon Kino Berlin
Programme: “Metropolis LIVE”
Original music written for the film by G. Huppertz
Babylon Orchester Berlin
27th July 2024 · Conducting
Bennett Gordon Hall
Programme: Dan Brown, Wild Symphony
Chicago Philharmonic
20th June 2024 · Conducting
Konzertsaal der Universität der Künste
Programme:
Stravinsky, “The Firebird” Suite (1919 version)
Staatsorchester Braunschweig
9th June 2024 · Conducting
Babylon Kino Berlin
Programme: “Metropolis LIVE”
Original music written for the film by G. Huppertz
Babylon Orchester Berlin
4th-7th June 2024· Conducting
Assistant conductor of Marin Alsop
Auditorium Radio France
Programme:
Jessie Montgomery, Strum
Gershwin, Concerto in F
Bartok, Concerto for orchestra
Orchestre Philharmonique de Radio France
26th May 2024 · Conducting
Jazz Institut Berlin
Programme:
“Schönberg im Exil” - crescendo festival
Raimonda Žiūkaitė: WWW
Ensemble ilinx
30th April 2024 · Conducting
Salles de Pologne, Leipzig
Programme: A.Dvorak/D.Brown: Rusalka
Fassung für Kammerorchester und Gesangsolisten
Sinfonia Leipzig
14th April 2024 · Conducting
Filmtheater Sendlinger Tor München
Programme: „Der Cabinet des Dr. Caligari“
Original music written for the film by G. Becce
Babylon Orchester Berlin
13th April 2024 · Conducting
Filmtheater Sendlinger Tor München
Programme: “Metropolis LIVE”
Original music written for the film by G. Huppertz
Babylon Orchester Berlin
1st April 2024 · Conducting
Babylon Kino Berlin
Programme: “Metropolis LIVE”
Original music written for the film by G. Huppertz
Babylon Orchester Berlin
19th February 2024 · Conducting
Babylon Kino Berlin
Programme: “Nosferatu LIVE”
Original music written for the film by H. Erdmann
Babylon Orchester Berlin
18th February 2024 · Conducting
Babylon Kino Berlin
Programme: “Metropolis LIVE”
Original music written for the film by G. Huppert
Babylon Orchester Berlin
17th February 2024 · Conducting
Babylon Kino Berlin
Programme: “Metropolis LIVE”
Original music written for the film by G. Huppert
Babylon Orchester Berlin
13th January 2024 · Conducting
Filmtheater Sendlinger Tor München
Programme: “Metropolis LIVE”
Original music written for the film by G. Huppertz
Babylon Orchester Berlin
12th January 2024 · Conducting
Filmtheater Sendlinger Tor München
Programme: „Nosferatu LIVE“
Original music written for the film by H. Erdmann
Babylon Orchester Berlin
17th December 2023· Conducting
Babylon Kino Berlin
Programme: “Metropolis LIVE”
Original music written for the film by G. Huppertz
Babylon Orchester Berlin
13th-24th November 2023· Assisting Steven Sloane
Philharmonie Berlin
Programme: Mahler, Symphony No. 6
Symphonieorchester der Universität der Künste Berlin
4th November 2023 · Conducting
Konzertsaal der Universität der Künste Berlin
Programme:
Nicolai, Die Lustige Weibe von Windsor – Overture
Strauss, Pizzicato-Polka
Brandenburger Symphoniker
5th November 2023 · Conducting
Neue Bühne Senftenberg
Programme:
Nicolai, Die Lustige Weibe von Windsor – Overture
Strauss, Pizzicato-Polka
Brandenburger Symphoniker
15th September 2023 · Conducting
Milchwerk Radolfzell
Programme: Dvorak, Symphony No. 9
Sudwestdeutsche Philharmonie Konstanz
21st July 2023 · Conducting
Konzertsaal der Universität der Künste Berlin
Programme: Mahler/Klaus: Symphony No. 4
Studio Orchestra of the University of Arts Berlin
3rd September 2023 · Conducting
14. Stummfilm LIVE Festival Berlin - Babylon Kino Berlin
Programme: “Rosita”
Original music written for the film by L. F. Gottschalk
Babylon Orchester Berlin
14th May 2023 · Conducting
Babylon Kino Berlin
Programme: „Der Cabinet des Dr. Caligari“
Original music written for the film by G. Becce
Babylon Orchester Berlin
1st-8th February 2023 · Assisting Harry Curtis
Konzertsaal der Universität der Künste Berlin
Programme:
Wagner, Lohengrin, Prelude to Act 3
Rachmaninof, Rhapsody on a theme by Paganini op. 43
Bruckner, Symphony No. 7
Symphonieorchester der Universität der Künste Berlin
04/02, 10/03, 08/04, 19/05, 29/10 of 2023 · Conducting
Babylon Kino Berlin
Programme: “Nosferatu”
Original music written for the film by H. Erdmann
Babylon Orchester Berlin
5th November 2022· Conducting
Konzertsaal der Universität der Künste Berlin
Programme:
Sibelius, Valse Triste
Verdi, La Traviata – Overture
Brandenburger Symphoniker
6th November 2022· Conducting
Neue Bühne Senftenberg
Programme:
Sibelius, Valse Triste
Verdi, La Traviata – Overture
Brandenburger Symphoniker
1st-3rd September 2022· Conducting
Pittlerwerke Leipzig
Programme:
“Nosferatu - Eine Symphonie des Grauens”
New music written for the film by D. Brown (2022)
Sinfonia Leipzig
1st June 2022· Conducting
Große Saal der Hochschule für Musik und Theater Leipzig
Programme:
Britten, A Midsummer Night’s Dream
Singers and orchestra of the Hochschule für Musik und Theater „Felix Mendelssohn-Bartholdy” Leipzig
March-June 2022· Assisting Matthias Foremny
Programme:
Britten, A Midsummer Night’s Dream
Singers and orchestra of the Hochschule für Musik und Theater „Felix Mendelssohn-Bartholdy” Leipzig
31st July 2021· Conducting
Park “Kleidou”
Programme:
Danielidis, “Saving Hope” (2021)
Musa Hellenica Festival Orchestra
30th July 2021· Conducting
Chios Mastic Museum
Programme:
Tryferopoulou, “Voices of Struggle” (2021)
Ziopoulou, “The words where dripping” (2021)
Musa Hellenica Festival Orchestra
4th July 2021· Conducting
Panometer, Leipzig
Programme:
Bizet/Brown, Carmen
Fassung für Kammerorchester und Gesangsolisten
Sinfonia Leipzig
3rd and 5th June 2021· Conducting
Große Saal der Hochschule für Musik und Theater Leipzig
Programme:
Jost, „Dichterliebe”
Singers and student orchestra of the Hochschule für Musik und Theater Leipzig
25th October 2019 · Conducting
Große Saal der Hochschule für Musik und Theater Leipzig
Programme:
Verdi, Rigoletto, Quartet “Bella figlia dell’ amore”
Offenbach, Les Contes d'Hoffmann: “Barcarolle”
Leipziger Symphonieorchester
21st September 2029 · Conducting
Open Theater “Kolonos” Athens
Programme:
Dvorak, Symphony No. 8
Athens City Symphony Orchestra
18th May 2018 · Conducting
“Anna Maria Kalouta” Hall Athens
Programme:
Mozart, Symphony No. 36
Beethoven, Symphony No. 4
Athens City Symphony Orchestra
30th September 2017 · Conducting
Park “Eleftheria” of the Center of Arts Athens
Programme:
Verdi, Il Trovatore, “Coro degli zingari”
Nabucco, “Va, pensiero”
Bizet, Carmen Suites 1 and 2
Athens City Symphony Orchestra