Conversation so far:
When did Tapper leave We Are Scientists?
September 2007 saw the band hire Max Hart for live performances. Days before the tour was due to start, drummer Michael Tapper quit the band
Do we know why Michael Tapper chose to leave We Are Scientists?
What did We Are Scientists do for a drummer, then, after their drummer Michael Tapper left?
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 was the one that Michael Tapper left We Are Scientists on?