Ok. All information should be free. All information wants to be free. Music is information. Therefore, I take the typical geek stance that Music sharing is a right. In fact, it is our responsibility and duty to the artists to download their music.
That said though, most commercial music has sold out anyway. Once a group signs a deal, they tend not to be as good, since they're making music not for enjoyment, but because they have to. Being locked into the contract means they have to write X number of songs, and so they just think of what they're doing, and write some underdeveloped lyrics about it over a typical beat. This certainly accounts for the amount of music about sitting under a tree smoking a bong....
Seriously, on the internet there are heaps of amateur music sites, which are legal and really really good. Between a few nerdcore rappers and OverClocked ReMix, I have nine cd's of Mp3 music. Almost all of it is free, and its all very good.