“We did a surprising amount of work before the tour started, we had about a month,” he says. “I got a lot of co-writing done, some great initial vocal material recorded, and just general collaborations with different producers.”
I admire his inclination not to overstate his role in the songwriting process, but I think it would have been ok if he'd just said writing instead of co-writing, no? Even if all it means is that he occasionally says "Oh, oh, oh, can I let out a super high-pitched squeal right there? No? How 'bout here? Here? Please?"