Conversation so far:
Why did Lou leave?
preparing to tour behind Long Hard Look as the opener for Steve Miller Band.
He went solo?
Gramm released Ready or Not in January 1987.
How was it received?
CANNOTANSWER.
Who replaced Gramm?
Johnny Edwards.
What did Gramm play?
lead singer.
Did he tour for his solo career?
tour behind Long Hard Look as the opener for Steve Miller Band.
Did Foreigner tour after he left?
played some European dates then made its official US debut on August 9 performing on the second night of a Billy Joel benefit concert.

Question: What else is interesting?
Self-contained rewrite: What else is interesting other than Foreigner's performance at a Billy Joel concert?