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Ottensamer first gained his orchestral experience as substitute clarinet in the Vienna State Opera and the Vienna Philharmonic and is a former member of the Gustav Mahler Youth Orchestra.
In 2005, the Festival began a contemporary music series and presentations by youth orchestras such as the Gustav Mahler Youth Orchestra, directed by Franz Welser-Möst, followed by the European Union Youth Orchestra under Vladimir Ashkenazy in 2006.