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Adelina Oprean


Student and then assistant of Alberto Lysy, Robert Masters and Yehudi Menuhin at the International Menuhin Music Academy in Gstaad, Adelina Oprean completed her studies with Sándor Végh at the Salzburg Mozarteum Academy.

She has received many prizes, including First Prize at Colmar and at the Carl Flesch International Competition in London in 1982. She is also a prize winner in Piano Trio competitions in Geneva and Belgrade, and in the 1981 Joachim Violin Competition in Austria.

Since her London debut in 1982 playing Beethoven’s Concerto with the Royal Philharmonic Orchestra at the Royal Festival Hall, she has performed as a soloist with most European orchestras. Her appearances include concertos with the South West German Radio Orchestra, the Tonhalle Zürich Orchestra, the Bergen Symphony Orchestra and frequent tours with the Stuttgart Chamber Orchestra, the Württemberg and the European Community Chamber Orchestras.

She has recorded the Enescu Sonatas and Fiorillo, Viotti, Haydn and Vivaldi concertos on the Hyperion label.

Since 1985 Adelina Oprean has taught at the Music High School in Basel, and since 1997 she has also been a member of the ARIA String Quartet.

Igor Keller


Studied with Adelina Oprean in Basel, Sándor Végh at the Mozarteum Salzburg, and at the International Menuhin Music Academy with Alberto Lysy. He completed his training with Walter Levin, Hatto Beyerle, Sigmund Nissel, Yehudi Menuhin and Joseph Silverstein.

In 1994 he founded the Ligeti String Trio, winning several competitions including the Osaka International Chamber Music Competition in Japan.

As a soloist, Igor Keller performed with orchestras such as the Orchestre Philharmonique de Strasbourg, the “Nouvel Orchestre de Radio-France”, the Sinfonieorchester Basel, the Württembergisches Kammerorchester as well as the Camerata Academica Salzburg.

A member of the renowned Amar Quartet since 2006, Igor Keller has played in most major venues in Europe, including the Wigmore Hall, the Lucerne Festival, the Tonhalle Zurich, the Menuhin Festival Gstaad and the Lockenhaus Festival.

He has extensive orchestra experience as well, as guest concertmaster with numerous symphonic and chamber orchestras. Since 2010 he has been first concertmaster of the St. Gallen Symphonic Orchestra.

Recordings include CDs for “Musiques Suisses”, NEOS and Léman Classics, as well as the complete Hindemith string quartets for Naxos.

Silvia Simionescu


Silvia Simionescu, international well-known violist enjoys a diverse career as a performing musician that has taken her all over the world. Her appearances in major venues such as Auditorium Barcelona, Philarmonia Saint Petersbourg, KKL Luzern, Teatro Colon Buenos Aires, Zurich Tonhalle, Casals Hall in Tokyo, Beethoven Halle Bonn, Wigmore Hall, Mozarteum Salzburg have been praised for her exceptionally passionate, intense and intelligent musicianship. Born in Romania, Silvia Simionescu took up playing the violin at the age of seven. She joins the International Menuhin Music Academy, in Switzerland, where she studies violin and viola with Yehudi Menuhin , Alberto Lysy and Johannes Eskaer.

Prizewinner in several international competitions, among others 1st Prize in the Brescia International Competition and 1st Prize of the Osaka International Chamber Music Competition (as a member of Trio Ligeti) she has performed as soloist in Romania , Japan and Italy. Over the years she was invited to perform in important chamber music Festivals like: Mont Fuji Festival, Folles Journées de Nantes, Kuhmo Festival, Sangat Festival (Bombay), Menuhin Festival (Switzerland), West Cork Festival (Ireland). As a passionate and devoted chamber musician she has the great opportunity to enrich her artistic experience playing with great artists such as Joshua Bell, Carolin Widmann, Ana Chumacenco, Alberto Lysy, Bruno Giurana, Leon Fleischer, Alexander Lonquich, Jurg Widmann, Cristian Poltéra. Since 2009, she is a member of Gringolts String Quartet and highly enjoys the most amazing masterpieces of the string quartet repertory.

Several CD recordings with works of Françaix, Reger, Dohnany, Schumann, Fauré, Franck, Chausson, Schumann, Brahms, Taneiev and Glazunov have been released by Ars, Leman Classics, Arion, Alpheé Orion and BIS. Since 2004 she has been a professor at the Music Academy Basel teaching viola and chamber music. Silvia regularly gives master classes in Germany, India, Switzerland and Spain.

Alexandre Foster


The Canadian cellist Alexandre Foster has been recognized both for his refined approach to music-making and his high versatility of playing. As a baroque and a modern cellist, he has, over the years, performed with leading artists of both fields in some of the most prestigious halls of Europe.

A devoted chamber musician, Alexandre Foster is a founding-member of the Calvino Trio, with whom he has played all over the world. The ensemble was awarded the First Prize “Norbert Schenkel”in 2015 at the Jeunesse Musicale Competition (Switzerland) and in 2016 the First Prize “Orpheus” at the Swiss Chamber Music Competition. In 2010, he was recognised for the world premiere of the Hermann Keller cello sonata, recorded live by SWR 2 Radio. Since 2020, he is also the cellist of the Basler Streichquartett.

On the baroque cello, he is a regular member of the ensemble “Les Passions de l’Ame” in Bern.He has had also the opportunity to perform with renowned specialists such as Els Biesemans, Leila Schayegh, Andrés Gabetta, Edoardo Torbianelli and Kristian Bezuidenhout.

Besides his career as a performer, he is also very much in demand as a teacher. After working more than five years at the Staatliche Hochschule für Musik und Darstellende Kunst in Stuttgart and at the Hochschule der Künste in Bern, he is now teaching at Musikschule Konservatoriumin Bern. He is also regularly invited in Masterclasses across Europe.

Among his teachers were David Ellis, Thomas Demenga, Conradin Brotbek, Rainer Schmidt, Anton Kernjak, Rita Wagner and Ferenc Rados. He also obtained a Master of Arts in Early Music under the tutelage of Christophe Coin at the Schola Cantorum Basiliensis.