Been ages since we had any “new” Horowitz material. An official CD release of the private Carnegie stuff would be nice, including the Bruno Walter collaborations.
And then there is the Gradova stuff, whatever is actually in there.
I thought we were supposed to get a better sounding release of the Rodzinski Rach 3.
The 1983 Japan concert was professionally recorded but never released, yet other inferior tour concerts from later that year were. It’s a rough concert of course, but it’s historically significant and even drugged up Horowitz is still valuable, especially with pieces he didn’t otherwise record, and the sound here is potentially better than later concerts.
There are several Chopin etudes from the last recording session that never got released. They exist, some have heard them and got copies but they are being hoarded.
I know there are some other pieces like an early Beethoven sonata that are listed according to recording logs, but it’s not always clear if they ever got completely set down on tape.
There has been insane advances in AI and optical playback. I wonder if there are broken shards of the prokofiev 8th sonata at yale a nerd could digitize and piece together.
April 23, 1945: Carnegie Hall, New York City, New York (discs broken)
Prokofiev: Sonata No.8 in B-flat major, Op.84 [New York Première]
Scarlatti: Two Sonatas [unspecified]
Czerny: Variations on Rode's La Ricordanza, Op.33
Tchaikovsky: Dumka - Russian Rustic Scene, Op.59
Chopin: Etude in F major, Op.10 No.8
Chopin: Etude in C-sharp minor, Op.25 No.7
Chopin: Etude in G-flat major, Op.10 No.5 (Black-Key)
Chopin: Grande Valse Brillante in A minor, Op.34 No.2
Liszt: Valse Oubliée No.1
Liszt: Hungarian Rhapsody No.6 in D-flat major
Encores:
Chopin: Mazurka [unspecified]
Brahms: Waltz in A-flat major, Op.39 No.15
Sousa/Horowitz: The Stars and Stripes Forever
April 24, 1950: Carnegie Hall, New York City, New York (most of it “lost”)
Chopin: Polonaise in C-sharp minor, Op.26 No.1
Chopin: Ballade No.4 in F minor, Op.52
Chopin: Mazurka in F-sharp minor, Op.59 No.3
Chopin: Mazurka in A minor, Op.17 No.4
Chopin: Impromptu No.1 in A-flat major, Op.29
Chopin: Sonata No.2 in B-flat minor, Op.35
Liszt: Consolation No.4 in D-flat major (Stern Consolation)
Liszt: Consolation No.5 in E major
Liszt: Au bord d'une source
Liszt: Funérailles
Liszt: Sonetto 104 del Petrarca
Liszt/Horowitz: Hungarian Rhapsody No.15 (Rákóczy March)
March 10, 1935*: Orchestra Hall, Chicago, Illinois
Bach/Busoni: Prelude & Fugue in D major, BWV 532
Scarlatti: Sonata in B minor [unspecified]
Scarlatti: Sonata in G major [unspecified]
Schumann: Humoresque, Op.20
Brahms: Variations on a theme by Paganini, Op.35 [a total selection of 12 variations from the two books]
Chopin: Barcarolle in F-sharp major, Op.60
Chopin: Mazurka in C-sharp minor, Op.50 No.3
Chopin: Etude in C-sharp minor, Op.10 No.4
Chopin: Etude in G-flat major, Op.10 No.5 (Black key)
Debussy: Etude No.3 (Pour les quartres)
Debussy: Etude No.6 (Pour les huit doigts)
Liszt: Valse Oubliée No.1
Liszt: Mazeppa (Etude No.4 from 12 Études d'éxecution transcendante)
[Encores included unknown works by Debussy, Brahms, Chopin, and, to send everyone home happy............ Ho own Carmen Variations of course, as the final encore]
I think that is the year, it’s difficult to read from the program.
An excerpt from a review of this concert is worth quoting:
“Hoplaying yesterday at Orchesta Hall, set standards for the piano and its litterature which no virtuoso of the present has equaled. Not only is his command of the resources of the instrument more extended than any the world has heard since Busoni was at the zenith of his powers, but the qualities of pianistic imagination which have developed this amazing control are such that he has advanced frontiers and boundaries for the whole art.
This imparts to his playing an impression of adventure, of new worlds conquered, of still other realms of beauty, more remote, that are about to be discovered. It matters little with what type of music he may concern himself.” (“Unequalled Today”, Glenn Dillard Gunn)
once made mention of a pozzibly legendary but maybe mythical ho prickzon 7 vid 
, NYC (dicks broken)