Cyber, on minimum shutter speed there is a rule of thumb: 1/focal length in mm. That is, with a 50mm lens you should not handhold at slower than 1/50th (or 1/60th) sec. With a 300mm, no slower than 1/300th sec. That is a really gross rule and is often used to forgive oneself for not using a tripod or monopod, etc. Of couse, with IS, it is not such a problem.
But in Live Performance shooting the biggest problem is the movement of the performers ... much worse than camera movement for me. However, it is sometimes surprising to see the blur when shooting 1/250th and the sharpness when shooting 1/20th ... go figure! I like a minimum of about 1/30th but I have some good images at 1/10th.
Something I didn't say in this thread was my process, so I'll run over over it in abbreviated mode: when I start, I almost always use Program Mode and ISO 1600. I shoot a few bursts of a couple of different things and review ... CHECK THE HISTOGRAM! ... then I may set the ISO down to 1250 (I don't know about the other bodies, but the 1D Mark II has a zillion ISO settings) to try to reduce noise. Then I shoot another few bursts and review ... CHECK THE HISTOGRAM (I should cut that so I can keep pasting it in!) ... then if I am comfortable, I will switch to Aperature Priority and start working with wide open, usually f2.8 ... sometimes this reveals that the camera was selecting a smaller f-stop and I could have been shooting faster. Anyway, I don't do this so much for the DOF but because the lenses usually shoot crisper/sharper nearer f8/f11 and the lighting and separation of the performers in my venues doesn't require using a shallow DOF to make them stand out. If the light is really bright (I can't figure out how this changes from show to show in the same venue) then I will edge down to ISO 800 (the slowest ISO I use in Live Performance) and work with the aperature.
I should note here that I attend to the exposure on the faces. Sometimes, when far away with lots of blackness in the frame, the exposure will want to be way too bright for the face of the performer. That is when I use the -1-1/3 compensation to darken it down. Review the images ... you know about the histogram, right? ... and this is another place where bracketing in 2/3 stops is very useful.
Here's another dirty little secret of mine: I don't shoot these types of events using RAW. I rarely use RAW. I shoot way too many images and spend way too much time on culling and other post processing. I frequently have 300-600 images to deal with (and a day job) and I shoot one to three events a week ... I need to spend time with my family and get exercise ... so while I truly believe that RAW is optimal, I don't do it.
Ask me again if I didn't cover what you actually asked ... I realize I went off on a tangent.