Conversation so far:
Who is Buffalo Springfield?
Stills, Furay, and Young reunited in Los Angeles and formed the core of Buffalo Springfield.
What did Buffalo Springfield do?
The band would release three albums.
What albums did the band release?
Buffalo Springfield, Buffalo Springfield Again, and Last Time Around.
What album was the most popular?
enjoy only one hit single, the Stills-penned "For What It's Worth.

Question: What song was most popular?
Self-contained rewrite: What song from Buffalo Springfield was most popular?