Vladimir Horowitz /
Schubert /
Impromptu No. 4 in A-Flat Major, D. 899

January 10 & 24, 1973 in New York City - Columbia 30th Street Studio
- ( 1 LP ) CBS 73 175
- ( 1 LP ) CBS 76175
- ( 1 LP ) Columbia M 32342
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- (70 CD) Sony 8869-757500-2 - 00:07:31
- ( 1 CD ) Sony SK 53471 - 00:07:35
- ( 1 CD ) Sony SMK 90433 - 00:07:32
- ( 1 CD ) Sony Japan SICC-1027 - 00:07:34


April 18 - 30, 1985 in New York City - Horowitz's Home
- ( 1 LP ) DG 419 045-1
- ( 1 LP ) Hungaroton SLPDL 12937
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- ( 1 CS ) DG 419 045-4 - 00:07:55
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- ( 1 CD ) DG 419 045-2 - 00:07:55
- ( 3 CD ) DG 427 269-2 - 00:07:52
- ( 1 CD ) DG Japan F35G 50295 - 00:07:48
- ( 2 CD ) Steinway & Sons B000707402 - 00:07:48

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