Darmstädter Ferienkurse
The Third Piano Sonata was first performed by the composer in Cologne and at the Darmstädter Ferienkurse in 1958, in a "preliminary version" of its five-movement form. A subsequent Darmstadt performance by the composer, on 30 August 1959 in the Kongresssaal Mathildenhöhe, was recorded and has been released commercially on CD2 of the seven-disc boxed set, Neos 11360, "Darmstadt Aural Documents, Box 4: Pianists" ([Germany]: Neos, 2016).