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Sure, I'm happy to elaborate... just mark this one Film Speed 101, by AQW.

All film is marked with an ISO number - the most common ones for commercially available print film are 100, 200, 400, and 800. The larger the ISO, the "faster" the film. Without getting too technical, the ISO indicates how quickly the film reacts to light (how "sensitive" - OTown pun intended - it is to light). The higher the number, the faster the film will form an image. Film with an ISO 400 rating reacts twice as fast to the same light as ISO 200 film, four times as fast a film with an ISO 100 rating, and eight times as fast a film with an ISO 50 rating. If you're shooting at high noon in broad daylight, an ISO of 50 or 100 will do the trick. For lower-light situations, you want a film that is more sensitive to light (reacts faster to light).

So what does this mean? Most concerts can be considered low-light situations. Usually for low-light, you want two things - fast film and fast shutter-speed. If you're using a point & shoot camera and can't manually set your shutter speed, your only variable is fast film... ergo, ISO 800 is often the choice. My only beef with 800 film is the loss of resolution (the photos are grainy, particularly when enlarged beyond the standard 4x6 print size). This is why I shoot 400 speed film - it's a compromise. I'd love to shoot ISO 1600 because it allows for such low light conditions... BUT... the grain is too large. The reason I gave the standard rule of always using the lowest ISO you can get away with for your lighting conditions is that slower speed film (lower ISO) has less grain, higher resolution... TADA!... clearer photos.

Does this help at all? Let me know if you need clarification, or more detailed info.

AQW