Thanks for the advice everyone.
Like someone mentioned, they can't afford to pay anyone, so I'll be doing this for beer.
Also, as far as shooting them while they play, that won't be done in front of an audience. That will be done in their studio, so I assume the lighting will allow me to get by with my slow lenses.
If you're talking about a recording or rehearsal studio then you're unlikely to have much available light in my experience, you'll have no daylight and chances are that the studio lighting will be low level, even if everything is turned up to 11
However, it does have the great advantage that you can move around wherever you want and take time to evaluate your shots as you go along, in fact if you can connect to your Mac laptop (if you have one) or download as you go, then it gives you/band a way to see if you're getting the shots you want. If it is a smallish recording studio then even just a bounced on camera flash will give you some fairly even lighting. I suggest you post very precise details then everyone can post more relevant advice, at the moment we're all having to guess the parameters. So, how many band members, what music genre, what is their style, age range, what are pics for (just a record of them now, for flyers, cd cover, posters, press releases, etc) as it makes a huge difference to what is required, are they aiming for fun/local/national/international stardom
, you need to find out approximate size and details of studio, precisely what equipment do you have available (I'm not familiar with Rebel, so what speed is the 17-85 and is it variable or fixed f-stop) have you got any types of off-camera flash/tungsten (even putting in some high wattage photo bulbs into studio lights may be possible, which could give some great available light/mood shots), etc...