Conversation so far:
what was some of John Butler earliest works?
Some of John Butler's ealriest work was with a band called Vitamin.
Did John butler ever go back to his band Vitamin?
John Butler formed The John Butler Trio in 2009
did John Butler ever marry or have children?
John Butler is married to Danielle Caruana. They have two children.

Question: did he ever tour in the united states?
Self-contained rewrite: Did John Butler ever tour in the united states?