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In page Katja Andy:

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From 1927, she gave duo concerts with pianist Agi Jambor. From 1930, she often played with Edwin Fischer's chamber orchestra and was his solo partner in the Mozart double concerto. In Bach's concertos for multiple keyboards, her fellow student and lifelong friend Grete Sultan joined Fischer and Aschaffenburg. For the 1933–34 season, 60 concert dates had already been fixed.[citation needed]