I've been enjoying Pandora since May, 2006. It has grown exponentially since then!
You can suggest artists for them to review if they aren't 'on the list'! I've done it several times, and now they show up in my stations regularly.
I recently upped to Win7 Ultimate, and I am going to sign up for PandoraOne, their premier offer, so I can put a Pandora player on my desktop.
I must admit, when I hear a good song or a new (to me) artist, I will gather some more music from them using eMule, and burn a CD or DVD. I might even make a new Pandora station featuring that artist.
That's the fun of this terrific website. Their Genome Project examines the qualities of the music, not the artist, band, title, etc., and links it to other similar sounds. You can 'Thumbs-up' or 'Thumbs-down' any song, and even ban it from your station, or move it to another station you have created. You can also purchase the song as well!
My musical tastes run mainly in the 'Big Band' genre (I'm old; coming up to 66 next month).
Anyhow, have fun with it!