I think five to ten dollars is a good number, but you really can't know until you experiment yourself. Also, the first arrangement you do might not be the best, so you have to do testing.
I think ur site is against the Adsense tos..Maybe u r providing free songs to download so that is illegal caz copyright etc...So Plz take my advice: Read the adsense tos...
Its very difficult to say how much you will earn... Since your site is about songs & you want to monetize it with Google Adsense, I recommend that you find high paying keywords in your niche using Google Keyword Tool & make sure you add Adsense ads above the fold to get high CTR (Click Through Rate)...
It depends on your niche, source of traffic and positions of ads. Its tough to predict what kind of amount you will make without knowing these things.
The financial muscle of your niche is going to decide your earnings. And the responsiveness of your site visitors.