Conversation so far:
Where did Buffalo Springfield first begin their career?
Buffalo Springfield formed in Los Angeles in 1966.
Who were the members of Buffalo Springfield?
Buffalo Springfield formed in Los Angeles in 1966 with Stephen Stills, Dewey Martin, Bruce Palmer, Richie Furay, and Neil Young.
Where did the name Buffalo Springfield come from?
Buffalo Springfield's name was taken from a brand of steamroller made by the Buffalo-Springfield Roller Company.

Question: When did they make their debut?
Self-contained rewrite: When did Buffalo Springfield make their debut?