I'm talking about the American version of the show. I'll put the answer to this question on the second page, but it's actually pretty easy to figure out. Just remember that The Grass Roots was a band in the 1960s and 70s (that leaves out 98% of the cast right there, they're too young) and that it was all male (that leaves out Pam and Angela, even if they were old enough). I think you've probably figured out who it is by now, but that doesn't make the video after the jump any less amusing.

He's the one on the left in the striped sweater.