It was Fats. . . Jelly Roll would have said "I invented jazz and this guy is ripping me off!"
Tatum. . . well a force on the piano that is likely to not be bested. I haven't explored a lot of his work, I've explored some, Decca, Capitol, the Pablo groups, the Mintons recordings, the Verve party recordings, and I'm still recovering from the assault to the senses taht the exploration has unleashed! There is so much there. I think I need to tackle the Pablo solo material next. . . .