Music trivia anyone?


First one to post the correct answer gets the positive votes.No negative votes allowed for the wrong answer. Anyone else with a music trivia question go ahead and ask.
QUESTION: Who is the walrus?
david99
ok, let's get more than one going at once. this one slightly tougher than david's first: why did harry nilsson sell his flat in london and to whom did he sell it?

BTW, david, a tiger can't change his spots. ;~)
I don't know why or to whom, but i have two guesses. John Lennon or keith Moon. ???? Why? Alcahol rehab? Or he had to leave the country? These are total guesses.
Another Question. What Hollywood actor played drums for Leon Russell at one time?