Well heck, if we want to play true confessions and/or name dropping, can I play too? ☺
I once played drums with the
Cowsills and accompanied
Aletra Hampton (sister to Slide Hampton and one of the famous
Hampton Sisters). I also did extensive accompaniment for one of the
Shangra Las (since she was my sister and also taught me piano). I also mixed live sound for
Harry Chapin and
Raúl Juliá.
Billy Joel and I (who had the same piano teacher, BTW) shared a bass player, and I composed and performed for and with
Martha Graham for 6+ years, often in close contact with
Liza Minnelli,
Nureyev,
Halston,
Baryshnikov,
Aaron Copeland, and "others."
If you want to count theater, as well as more dance & film folks we've
actually worked and collaborated with, let me know and I'll be happy to start the list.
Oooops! Left out my TV work with
Armelia McQueen right after she won her Tony Award for
Ain't Misbehavin'. The best part of that was chatting with
Hank Jones backstage after the show. Oh wait, does "chatting with" count, 'cause I have a list there as well.
How about "beds we've slept in?"

Top of my list there is
John Cage but alas (and thankfully) he was not there at the same time.