I sent some info to someone who made this post on a forum
"Ritchie got me onto this by sending me a link. I installed it last night thinking it would be some average music service, its not its brilliant.
This is a new service that is totally free and legal, funded by the odd advert that plays between songs every 30 mins or so and which only last a few seconds. You don't download the songs it streams them but in very high quality and instantly and it allows you to create playlists simply by right clicking or dragging a song.
You can also send links to people that also have the software or create collabrative lists, could be quite useful here.
Anyhow here's the link http://www.spotify.com/en/ "
It'll not work in the USofA and in certain other countries you need an invite ... however in the UK at the moment you can download it without an invitation.