Conversation so far:
What did Buffalo Springfield manage?
CANNOTANSWER.
What was a recording from Buffalo Springfield?
"Nowadays Clancy Can't Even Sing".
Did they record anything else?
"For What It's Worth.
Any other song?
"Baby Don't Scold Me.
Did they do anything other than songs?
CANNOTANSWER.
Who manages them?
Charlie Greene and Brian Stone.
How did they find Charlie Greene?
Davis sought advice from Sonny & Cher's management team, Charlie Greene and Brian Stone.

Question: How about Brian Stone?
Self-contained rewrite: How did Buffalo Springfield find Brian Stone?