It occurred to me that there are performers not typically recognized as keyboard players. There's a wonderful shot of the Beatles spit-balling with all 4 of them at keyboards but Paul McCartney can really play - it's hard to duplicate; also John Lennon's backwards 'Moonlight' at least says big hands. Aretha Franklin could flat out play - little known fact: she was Kieth Richards go-to pianist for his solo work. Then there's the (in)famous Nanker Phelge, a pseudonym for various Stones and possibly manager Loog Oldham (they used some clever angles in the video 'Sympathy for the Devil' to obscure the player(s)). Pete Townshend in his quieter moments? John Paul Jones Zeppelin bassist. John Legend a current 'piano man'. Then there are many famous performers in the pretty good category including Michael Jackson, David Bowie, Freddie Mercury, George Harrison, Lenny Kravitz, Joni Mitchell, Bob Dylan, The Edge and (just to keep the peace) Lady Gaga.