Joseph Horowitz at The American Scholar:
The biggest recent find in classical music was the discovery that in 1940, Sergei Rachmaninoff was privately recorded by the conductor Eugene Ormandy. Seated at Ormandy’s piano, he played through his new Symphonic Dances, which Ormandy would soon premiere with the Philadelphia Orchestra. Singularly, Rachmaninoff never permitted his public performances to be broadcast—so this surreptitious home recording is the best evidence we have of what Rachmaninoff’s legendary pianism sounded like outside the confines of recording studios sucked clean of the oxygen a body of listeners can activate.
Rachmaninoff’s RCA recordings are justly famous. They document his imperious, interpretive mastery, embellished with miracles of color and texture. But they are also emotionally controlled. When we eavesdrop on Rachmaninoff playing privately for Ormandy, the cork is out of the bottle: his keyboard presence surges with cataracts of feeling and sound. (It’s all documented in a three-CD set, Rachmaninoff Plays Symphonic Dances, issued in 2018 on the Marston label.)
more here.