Conversation so far:
who founded the John Butler Trio?
The John Butler Trio is fronted by John Butler on vocals and guitars.
who else was part of  the John Butler Trio besides John Butler on vocals and guitars?
With John Butler, Gavin Shoesmith and Jason McGann on drums, John Butler Trio was formed in Fremantle

Question: when was it formed
Self-contained rewrite: when was  the John Butler Trio formed