Conversation so far:
when was the band cancer bats formed?
Cancer Bats was founded in May 2004 by singer Liam Cormier and guitarist Scott Middleton.
why did they call it Cancer Bats?
the band considered the names Cancer Bats and Pneumonia Hawk after deciding that a combination of illness and animal name would give the best band name.
who else did they add to their band?
Mike Peters replaced Bath on the drums and the band began playing throughout Southern Ontario, playing live shows with bands like Billy Talent.

Question: what kind of music did they play?
Self-contained rewrite: What kind of music did Cancer Bats play?