Stockhausen Verlag Tekte 12 (2CD)

KADENZRHYTHMIK im Werk Mozarts (1961)
Lecture spoken in German followed by a complete recording:

Mozart: Konzert für Klarinette und Orchestra in A-dur KV 622

Kadenzen von K. Stockhausen

 1978
Suzanne Stephens, RSO Berlin conducted by Karlheinz Stockhausen recorded June 1985 33'13'"

also released on

 Acanta 25 331 (LP)
Stockhausen Complete Edition 39 (2CD)