Jazz Band Shoot - Need some advice

I was asked to shoot some images for a local high school jazz band. 4 kids. They are doing very well and are in pretty high demand. They want a website & promotional materials to expand their reach.

I ma more of a sports shooter and this is a little foreign to me. So I am looking for any and all advice I can get to help me out here.

I have 4 58-0EX's and an ST-E2 to run them off camera....as well as a set of AB800's....and no idea on what I'm a doing with them yet

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If you're shooting them performing, I wouldn't use flash unless I absolutely had to because you'll lose the nice colors. You do have to contend with faces in black holes next to hot spots though, so some fill might be good.
But it's hard to say what the trends are these days, so I'd ask them to show me some examples of what they have in mind?

Concert Photography Tips: A FAQ Perhaps

And near your thread: Behind the scenes Band shoots

Is that what you had in mind, or something else?

Live performance or promotional type studio/location shoot?