Title from program booklet.
"The last Impromptu is incomplete as the program's length surpassed the tape reel's capacity"--Notes, p. 5. "The cadenza for the Mozart concerto was composed by Denis Matthews ... [which] contains additional lead-ins and embellishments... [Horszowski] ... did not use [Matthews'] lead-ins in the II and III movements--they are probably his own"--Notes, p. 6.
Compact discs.
Program notes about the pianist by Allan Evans & Cynthia Raim inserted in container.
Recorded from live performances: Dec. 16, 1967 (Bach), Nov. 21, 1966 (Schubert), & May 29, 1968 (Mozart; during the Festival Casals).