Right, some of you have probably seen this before, but I couldn't find it posted on Subsim so...
The picture here:
http://office.zehuti.com/stuff/75_bands.jpg apparently contains 75 band's names, I think some of the clues can have more than one meaning.
I don't have a definitve answer (I think I've got about 40 of them), but there's probably one out there on the net somewhere, so no spoiling the fun and doing a cut + paste from another site :O)
A few starters:
1. The two jets overhead - B52s
2. Front left corner - Guns n Roses
3. Guy with the sledgehammer - Smashing Pumpkins