Conversation so far:
what is Buffalo Springfield?
Buffalo Springfield was a Canadian-American rock band active from 1966 to 1968 whose most prominent members were Stephen Stills, Neil Young, and Richie Furay.
was Buffalo Springfield an album?
Buffalo Springfield is the eponymous debut album by the folk rock band Buffalo Springfield, released in December 1966 on Atco Records.
were the Buffalo Springfield band albums hits?
Buffalo Springfield peaked at #80 on the Billboard Top Pop Albums chart. Buffalo Springfield Again peaked at #44 on the Billboard 200.

Question: what did he do with Crosby?
Self-contained rewrite: what did Stephen Stills do with David Crosby?