I've shot a few concerts, on a 7D but also recently on Film.
The easiest thing to do, in my experience, is M (well, the film bodies all have to do this anyway). I shot a whole concert, the film was obviously always the same ISO (4000 using Delta P3200), wide-open aperture (f/2.8 or f/4 depending on lens), and 1/30s (bit slow, but they weren't moving much, and the lens was 300mm on a tripod at the back of the room). I just got it home and scanned it, they were all pretty much perfectly exposed, nothing that couldn't be fixed in PP, boosting up dark areas works surprisingly good.
Using the 7D, I've tried Av with fixed ISO, Av with auto-ISO, Tv (1/100s or so) with auto-ISO (which just makes it shoot wide-open anyway, before it starts bumping up the ISO), using all of centre, spot, centre-weight, evaluative metering (with evaluative normally I have to shoot at -1 or -2 EV Comp because it's generally bright-face on black-background). And when i get home and look at them, they're all taken within a stop of each other. So I've just ended up doing M for most things, once i've taken a few Av shots to get a light reading. Anything within +/- 1 stop or even more can just be moved around in DPP when RAW-converting. As always, expose as bright as possible without blowing highlights on faces, once your highlights are blown, then there's no hope...
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