Replying to Help with music

hey im in computer class and i can download music off a site called pure volume but i have one problem i am having a complete mental blank and cannot think of ne good bands that i would b able to download so i was wonderering if ppl could post good bands that play rock or rap that r not too mainstream thanks dont tell me obvious bands like for example tupac or rage against the machine ... i need bands that r good but not mainstream thanks