Just like Michelangeli, Horowitz was of the opinion that a pianist should study the whole reperoire, but be selective in the works to be played in front of an audience.
While his Bach-Busonis do not represent the heights of his discography -just compare with Lipatti-, I do consider Horowitz' Scarlatti as one of the milestones in the history of recorded sound.
So how is the Bach? Very interesting!
We are currently in the (post-)authentic era. After the romantics like Horowitz and Fischer, the objectivists like Walcha and Karl Richter, the authenticists like Leonhardt and Harnoncourt, we are currently in a post-paradigmatic stage. It took them a while, but even the Gilberts, Koopmans, van Asperens, Tans, etc. etc. have finally figured out that their "authentic" approach was often more romanticized, than the one they despised in their predecessors. For those in doubt just listen to this performance.
Comparing Horowitz' Toccata to versions by Gould and Argerich highlights what a skilled and original artist he was. This Toccata represents an early work of the greatest master and often substitutes theatrical drama for more mature contrapunctual skill. This is ofcourse right down Horowit' alley. He plays the piece highly imaginative, dramatic, and with great clarity. A true blockbuster.
This recording highlights how modern Horowitz was. He is often portrayed as the last romantic, but just compare this Bach to Rachmaninov's Sarabande of Bach's fourth Partita in the complete Rach. recordings.
All the other works are available in technically better versions that I strongly prefer based on the dismal sonics of this disc.
Buy this disc. The Bach by itself warrants the price of admission.