Conversation so far:
Who formed the band Nitty Gritty Dirt Band?
The Nitty Gritty Dirt Band was founded around 1966 in Long Beach, California, United States, by singer-guitarist Jeff Hanna and singer-songwriter guitarist Bruce Kunkel.
How did Nitty Gritty Dirt Band gather the other members of the band?
Hanna and Kunkel joined informal jam sessions at McCabe's Guitar Shop in Long Beach.

Question: Were there any more musicians who joined the band?
Self-contained rewrite: Were there any more musicians who joined the band Nitty Gritty Dirt Band?