Conversation so far:
When did Tapper leave We Are Scientist?
Days before the tour was due to start, drummer Michael Tapper quit the band.
Do we know why he chose to leave?
CANNOTANSWER.
What did they do for a drummer, then?
Gary Powell and Adam Aaronson took over from Tapper for the remainder of the tour.

Question: Which tour was this?
Self-contained rewrite: Which tour did Adam Aaronson take over Tapper in We are Scientists?