Sonia Khan is an expert in the field of public speaking and theatre. Her artistic expertise involves the teaching of phonetics, debating, histrionics, elocution and effective communication skills. She has been regularly involved in the direction of theatre, musicals and special events at various renowned institutions in India such as the Delhi Public Schools. Moreover, some of the projects directed and managed by her have involved hundreds of children and youth endowing her ample management experience over more than a decade.


Email: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

Sandra Rudolfi Gerstner was born in Croatia and started to play the Violin in age of five at School for Young Talents in Serbia. Subsequently she studied at the Vienna University of Music and got her degree as Rainer Küchl’s (first Violinist of Vienna Philharmonic Orchestra) student.
With her Quartet and Octet she won first prizes in chamber music competitions in Serbia and Belgium.

She had also performed concerts in France, Switzerland, Turkey, Germany, Spain, Italy Poland and China as chamber musician and orchestra player and worked with numerous conductors and soloists among then Zubin Mehta and Coupson.

During her studies she was supported by the Vienna University of Music and Alban Berg Quartet. She took part in several master classes in Austria and Croatia with famous violinists such as Miroslav Rusin, Sergej Kunakov, Vladislav Igolinsky and Grigorij Zhislin. Sandra Rudolfi Gerstner now lives in Vienna.

Loreta Maria Bartess was born in Lithuania and started to play violin at the age of nine. As a young violinist she participated and won several competitions in Lithuania. In 1995 she continued her violin studies at the National Academy of Music and Theatre in Vilnius with Prof. Raimundas Katilius and Prof. Kornelija Kalinauskaite, and later at the University of Music and Performing Arts in Vienna. Thereafter she started to play with the most important orchestras of Lithuania: The National Symphony Orchestra of Vilnius and The City Chamber Orchestra of St. Kristoforus. She participated in the master classes of the “Daniel” string quartet, (Netherlands) and the E.Ysaye” string quartet(France). With the string quartet “Christoforus” she has played in several international Festivals in Germany (Bach Akademie Stuttgart), the Netherlands (Daniel Musik Dagen), and France(festival de Musique de Chambre-Orleans).

Additionally, Loreta Maria Bartess has performed with the following Orchestras: Vienna City Chamber Orchestra; Chamber Orchestra of Rotterdam, The Philarmonic Symphony Orchestra of Rotterdam,(director:Valery Gergiev) and The Symphony Orchestra of Amsterdam.

Michael initially studied violin at the Joseph Haydn Conservatory in Eisenstadt in Eastern Austria. At the age of 16 he changed to viola and studied with Prof. Hans Peter Ochsenhofer at the Music University Vienna and with Prof. Herwig Zelle at the Vienna Conservatory until 2004. Besides his musical studies Michael went to the Musikgymnasium Wien and played in many different Viennese orchestras. He worked together with some of the world´s leading conductors like Claudio Abbado, Valery Gergiev, Christoph von Dohnányi and Manfred Honeck.

He is still a member of the International Danube Philharmonic Orchestra and leading viola player of the Orchestra of the Vienna University. Studies of musicology at the Vienna University complement his musical skills.
He is also member of “Ensemble Klesmer Wien”, a traditional group for Jewish music, and of “Die Tanzgeiger” (The dancing fiddlers), an Austrian folk music group. He has performed in Austria, Germany, Venezuela, USA, France, India, Russia, Kazakhstan, Romania and Italy.

Michael plays a master viola made by Geoffrey Ovington, New York 1991. In April 2004 he also started to work for Radio Stephansdom, a prestigiousViennese classical radio station.

Cello studies with various well known cellists in Linz and Vienna. Activ as a cellist and cello teacher; intensive cooperation with international artists such as Ingo Ingensand, Thomas Doss, Johannes Meissl, Alfred Peschek, Vijay Upadhyaya, Luisa Albrechtova, Christoph Berner, Paul Gulda, Louie Austen and Schorsch Kamerun within the Wiener Festwochen.

Orchestral experience from regular participation in ensembles such as the Wiener Akademische Philharmonie, the Orchester der Technischen Universität Wien, the Youth Symphonie Orchestra of Upper Austria, the Innviertler Kammerorchester, the Linzer Philharmonie, the Vienna Festival Symphonie Orchestra, the Vienna Star Orchestra and the Orchester der Universität Wien as principal cellist. Numerous performances with the Linzer Ensemble für Neue Musik in Alfred Pescheks Bergtheater. Regular concert activities in Europe and Asia.

Particular interest focused on music in theatre and film and crossover projects. Participation in musicals and movies, such as in the 2008 Bollywood-movie „Yuvraj“ in the role of an orchestra cellist and also as personal coach of leading actress Katrina Kaif. Collaboration with several rock and pop bands. Numerous CD-recordings, sales reaching to East-Asia. Academic education in Musicology.

Born in Germany 1982, Marius Gussmann discovered early his passion for music. After starting with piano he switched to the double bass and after first orchestra impressions and years of apprenticeship in his hometown Aschaffenburg he started during his high school visit his academic career at the University of music and performing arts Hannover as a student of Prof. Peter Pühn. As a member of the Bavarian Youth Orchestra and the National Youth Orchestra of Germany he collected already early big orchestral experiences in cooperation with such famous conductors and soloists like Gerd Albrecht, Yakov Kreizberg, Andrey Boreyko, Eiji Oue or Tabea Zimmermann.

After his university-entrance diploma in music his studies leaded him to the Folkwang University Essen in the class of Prof. Niek de Groot before changing to Vienna to the Konservatorium Wien Private University, where he continued his studies with Andrew Ackerman and Botond Kostyak. Since this time he received several engagements from (chamber-) orchestras and festivals nationally and internationally as well as memberships in foundations like the Junge Musiker Stiftung or the Podium junger Künstler. He also did several substitute employments for example at the Deutsche Oper am Rhein, the WDR Musikfest, the Tonkünstler Orchester Niederösterreich or as principal double bassist in the Young Sound Forum of Central Europe. Concert tours leaded him to the most important places in Europe, to the Middle East and Japan.

Beside his orchestral career Marius Gussmann discovered also his passion for chamber music, which brought him to competitions like the Boris Pergamenschikow Competition in Berlin and to an active chamber music occupation, nationally as internationally, as numerous concerts across Europe as well as festival participations for example at the Kammermusikfest Lockenhaus with Gidon Kremer prove.