a couple month ago i discovered this website.
its a music portal its legal and its free!
you can be a member and save libraries and playlists favorites and so on.
if you go VIP (which is basically a 3$/month subscription) you get a software so you dont have to open your browser to listen music. and it integrates with last.fm and so on.
i really like it and even consider to go vip for 30$ a year.
my friends say that it is a bit slow on mac's
might be a flash bug.