Conversation so far:
when did Michael Anthony (musician) get into music?
He took an interest in guitar as a teenager, but picked up the bass instead since most of his other friends already played guitar or drums.
what was his first release?
During this time, bass player Mark Stone parted ways with Mammoth and the Van Halens decided to audition Anthony as a replacement.
Did they like him?
After the session, the Van Halen brothers asked Anthony to join their band.
where did he learn how to be a bass player?
CANNOTANSWER.

Question: what other bands did he play with before Van Halen?
Self-contained rewrite: what other bands did Michael Anthony play with before Van Halen?