Drummers are a pain in the arse, to be blunt. I think I've only ever taken a couple of drummer shots that I'd say were any good. It depends on the size of the stage as well - on big stages, things (including the drummer) tend to be well lit. On smaller stages, drummers tend to be somewhat left in the dark.
If you're shooting a pro gig, then you don't have time to be messing around with different lenses since you can only shoot three songs usually, a tripod is far too cumbersome for those circumstances, and you can't use flash obviously, so I tend to use the f/1.4 50mm - seems to work for me pretty well most of the time (though I wear glasses which makes manual focus a no no - and autofocus is a pain with drums - it's always attracted to the shiny bits of hardware).
General gig photography hints?
Erm... check your layout in advance, don't turn up as the band are going onstage... Be friendly and have a little chat with the stage security, you'll be thankful when they aren't dropping crowd surfers on your head as you're lining up a shot... Be discreet, you're inbetween the band and the audience, but you don't want to be in the way of the audience experience... focusing on the guitar strap tends to be a good focal point to get everything in nice and sharp... watch out for autofocus hitting shiny hardware (mics, drum hardware etc).
Finally, don't bother with the bass player. They all look the same, they never do anything, and are essentially interchangable units
There's a bunch of gig shoots at
http://www.myspace.com/wehaveyourmonkey (plug plug

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