Downloading music should be free.
But: If you are downloading copyrighted music which are sold in the stores it should be disallowed.

But why do you think so many people keep downloading?
Because they cant afford it? Yes and no.
They surely can afford to buy some CDs but keep in mind that the CDs are getting more expensive every year.

Why should I pay 15 - 20 bucks for a record I can download for free (of course there's the cost for the internet connection.)?
Whats the difference? If I buy a CD in a store I get a plastic cd box with some plastic cover which does nothing than pollute the enviroment

What I want to say is that the big corporations shouldnt go sue everyone for downloading mp3s or sharing mp3s but to reconsider their publishing strategy.