And down, and down - sometimes people seem to decide the ideal speed is a bit slower than he's singing it, and stick to that idea even if you try and slow down to meet them. The time that happened to me was also the time I'd put a song into 3:4 - or rather, I'd put the verses in 3:4; the session decided collectively that the refrain should stay in 4:4, thanks very much. (And not quite so fast, while you're about it.)
Great session otherwise, mind. Those that can harmonise certainly should, in my view.