Conversation so far:
Where was he born?
Sandberg was born in Stockholm.
Where did he grow up?
grew up in the suburb Stenhamra, Ekero Municipality.
When did he become a singer?
As a child.
What did he do as a child to help his singing career?
Martin was a student of Sweden's public music-education program.
Was he in a band?
As a teenager he sang in a variety of bands before joining a glam-style metal band called It's Alive in 1985 as their singer and frontman.
Was the band good?
CANNOTANSWER.

Question: Did he sing with other bands?
Self-contained rewrite: Besides It's Alive, did Max Martin sing with other bands?