Which of the following bands is a side project of John Flansburgh, one of the founding members of They Might Be Giants: Mono Puff or Sum 41?
Mono Puff: Mono Puff is a New York City-based band and a side project of John Flansburgh, one of the founding members of They Might Be Giants. Sum 41: Sum 41 is a Canadian rock band from Ajax, Ontario.
Mono Puff