Have owned two of these, one brand new back in '02 as my primary, one used, much more recently ('09 or early '10 I think) just to play with.

Fantastic machines - beautiful, super-function, and perhaps the most fun and nearly "human" of all Macs.

But for modern browsing with multiple pages/tabs, flash, and such, it's kind of a dog. Even with maxed out RAM it's not going to be snappy.

For music I think it'd be fine, although the machines are a little noisier than today's iMacs and Macbook Pros/Airs (though much LESS noisy than the appallingly loud iMac G5s).

Hope this helps!