If you're happy with a basic kit zoom then fill your boots!
The op isn't looking for a wide angle lens though. he needs a wide apeture to let more light in so as to use a faster shutter speed or lower iso. for shooting bands in low light situations. Also a standard or slight telephoto will be more suitable for the portraiture aspect of his requirements.
You cant get that on any cheap kit lens that i'm aware of [correct me if you know of a cheap zoom that will do standard to tele with a 1.8 / 1.4 apeture]. Shallow depth of field is great when it comes to portraits, its one of the great things about medium format cameras, the larger the format, the shallower the depth of field will be for the same apeture on a smaller format camera.
Personaly, i think a prime lens will always have better optics / sharpness than a zoom at a given price point.
Whilst not as versatile, i believe using a prime lens will generally improve your photographic skills with regards composition, you have to think about things a little more.
Being a little facetious, you can often use your feet to move closer or further away from the subject. Think of the Father Ted cows sketch, "these cows are small, those ones are far away'