Baldur is committed to contemporary music and has championed the music of composers such as Harrison Birtwistle, Brett Dean, Unsuk Chin, Thomas Ades, John Adams and Jonathan Harvey.
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Hagner has performed the world premieres of two violin concertos: Unsuk Chin's violin concerto, in 2002 with the Deutsches Sinfonie-Orchester and Kent Nagano, and Simon Holt's violin concerto, in 2006 with the BBC Symphony Orchestra and Jonathan Nott.