I am composing a list of artists that I have discovered since I started listening to Pandora. These are artists that, had it not been for Pandora, never would have been the beneficiaries of my $12's for a CD. I have lots of CD's.
It seems that Pandora runs the risk of shutting down because of royalty costs. I'll let you do your own research.
I'll update this post as necessary to add to the list of artists. I encourage you to add comments with artists you have discovered as a result of Web Radio or the Internet.
In no particular order:
John Butler Trio