Jorge Bolet -
Bolet At Carnegie Hall (1974)
The late Cuban-born pianist has fewer than 200,000 plays on last.fm, so I'd have to call him somewhat obscure. His NYT obit says he was frowned on by the highbrows in the oh-so-hip 60's for being "too focused on romantic virtuosity", whatever that means. Sounds like codespeak to slam a guy who persisted in playing a lot of those old dead guys like Bach and Chopin without turning them inside out like Glenn Gould did.
This album presents his breakthrough performance at Carnegie Hall and it is stunning. Not everyone would dare to open by slamming the audience with 15 minutes of Busoni's piano transcription of the quasi-psychedelic "Chaconne" from Bach's Solo Violin Partita in D-minor, of which Brahms said:
"The Chaconne is for me one of the most wonderful, incomprehensible pieces of music. On one stave, for a small instrument, the man writes a whole world of the deepest thoughts and most powerful feelings. If I imagined that I could have created, even conceived the piece, I am quite certain that the excess of excitement and earth-shattering experience would have driven me out of my mind."
Then Bolet hits all 24 Chopin preludes straight through. After this softening up, Jorge threw out some familiar Strauss and Wagner then ended the evening with triumphant readings of two unfamiliar works, Moszkowski's "La Jongleuse" and Anton Rubinstein's Etude In C. Op. 23, No. 2 (Staccato"). The guy sure had guts to go with his prodigious talent.

on the Sam-O-Meter.
Trivia note: While serving in the US Army occupying Japan after WWII, Bolet conducted the Japanese premiere of Gilbert & Sullivan's
Mikado. Like I say, the guy had guts.