Conversation so far:
Where did the Allman Brothers tour between 1991 and 2000?
Did the Allman Brothers make any music between 1991 and 2000?
The Allman Brothers recorded two more studio album, Shades of Two Worlds and Where It All Begins.
Why did Gregg Allman stop drinking?
Seeing the induction of the Allman Brothers into Rock and Roll Hall of Fame, where Gregg Allman was severely inebriated, served him as a catalyst to quit alcohol

Question: Why did they leave the band?
Self-contained rewrite: Why did some of the band memebers leave the Allman Brothers?