Conversation so far:
What is Fats most famous song?
40 ("Red Sails in the Sunset", 1963).
What did he leave Imperial?
CANNOTANSWER.
Where did he go after he left Imperial?
1970, leaving ABC-Paramount in mid-1965 and recording for Mercury Records.
What songs did he release through Mercury?
had a Top 100 single, a cover of the Beatles' "Lady Madonna".
Did he win any awards?
CANNOTANSWER.

Question: Was her very famous during this time?
Self-contained rewrite: Was Fats Domino very famous during the 1963-1970s?