Conversation so far:
What were the changes in the 90s to REO Speedwagon?
By the late 1980s, the band's popularity was starting to decline.
Why did Alan Gratzer leave REO Speedwagon?
Original drummer Alan Gratzer left in September 1988 after he decided to retire from music to open a restaurant.

Question: Why did the band lose popularity
Self-contained rewrite: Why did REO Speedwagon lose popularity?