I'm guessing drummers have really big forearms, true?
Very untrue. Some do, some don't. Maybe calves, or the right calve for the bass drum. You work more slow twitch fibers when playing the drums. These are not as evident in appearance, much like a runner.
Speaking of runners, do these guys have a dedication like no other to put on as little lean body mass as humanly possible? When I see people run, I cringe. Nice way to lose the muscle you just worked for...assuming you're running for more than 5 minutes at the same pace.
I know, not everyone wants the bodybuilder look....translation: I don't want to work too hard when I go to the gym..haha
Epic Ramble