Conversation so far:
What was a hit of Hanson's besides mmmBop?
Another of Hanson's hit songs was Yearbook.
What did the band Hanson originally do?
Hanson is an American pop rock band.
What did Hanson do?
Hanson is an American pop rock band.

Question: Who was in the group
Self-contained rewrite: Who was in the group Hanson?