After years of using http://grooveshark.com
and through a few theme changes, I must say I am a diehard.
I have an api account for GS and so on, have made a few plugins here and there for things from widgets webbased to shell extensions. They are great people who are legit. 100% legal streaming music. No, you don't own the music but you are allowed to listen.
Grooveshark is for those music lovers who focus on what matters, that being music.
It's more than just music. it's a social website FOR music lovers. You have to option to follow people who listen to things you like to a messenger service. If you do not have an account, that does not stop you. You as a "lurker" can listen to anything that non registered members can. There is a plus account that gets you options. Nothing with content via extra music, just options. The plus account will also allow you to be apart of the mobile project.
I say to you, why stream video content while you just want music. I think grooveshark is here to stay. Lets help it get there. Say goodbye to pandora.