Both works are a legacy. Schubert's Arpeggione Sonata is the only document that such an instrument existed, no longer exists today and has been replaced by a viola or cello. Shostakovich's Viola Sonata is his last work; he died a few days later. A legacy of his thoughts and musical explorations, one of his most famous works. Andreas Willwohl travels as a soloist with his viola, but is also a member of the highly acclaimed Mandelring Quartet. Daniel Heide is certainly very famous as a partner to various singers, but also as a chamber musician.