Conversation so far:
Where did they form?
formed in Norwood, Ontario.
When did they start the band?
1992.
How many of them were in it initially?
The band's line-up consisted of lead vocalist Adam Gontier, drummer Neil Sanderson, bassist Brad Walst, lead guitarist Phil Crowe, and rhythm guitarist Joe Grant.
Where did they play their first gig?
CANNOTANSWER.
Did they have any fallings out?
Most of the members were attending high school when the band formed.
By the end of 1995, the band had broken up.

Question: Why did they break up?
Self-contained rewrite: Why did Three Days Grace break up?