Conversation so far:
What were beginning years like for the band?
The Nitty Gritty Dirt Band was founded around 1966 in Long Beach, California.
Who were the founding members of the band?
singer-guitarist Jeff Hanna and singer-songwriter guitarist Bruce Kunkel.
What was the genre or style of music they chose to play?
started as a jug band and adopted the burgeoning southern California folk rock musical style.
What album did they release during this period?
CANNOTANSWER.
Were there any significant performances during this period?
Browne was in the band for only a few months before he left to concentrate on a solo career as a singer-songwriter.

Question: DId they experience any other significant changes in the band during this period?
Self-contained rewrite: Did the Nitty Gritty Dirt Band experience any other significant changes in the band during 1966-1969 other than Browne leaving?