The Musikkollegium Winterthur is a Symphonic Orchestra and consists of approximately 50 professional musicians performing in more than 60 concerts per season. The repertoire focuses on contemporary music, classical music and early romanticism – the orchestra also brings to fresh light on great symphonic works such as Johannes Brahms, Pyotr Ilyich Tchaikovsky and Felix Mendelssohn. Composers such as Joseph Haydn, Wolfgang Amadeus Mozart, Robert Schumann and Franz Schubert are also regularly on the programme. Opera and ballet productions, such as Sergei Prokofiev's Romeo and Juliet, chamber music events with the Winterthur String Quartet, formats at the interface with jazz or film and its award-winning educational programme for schools, families and adults round off its wide range of activities. Several world premieres by composers such as Richard Dubugnon, Johannes Maria Staud and David Philip Hefti also take place each year. Since Season 21/22 the Musikkollegium Winterthur has been under the direction of chief conductor Roberto González-Monjas. Internationally sought-after conductors such as András Schiff, Barbara Hannigan, Heinz Holliger and Andreas Ottensamer and soloists such as Ian Bostridge, Yuja Wang and Patricia Kopatchinskaja are regular guests in Winterthur.