Now that Spotify is available in the US, invites seems to be useful again.
Spotify has been one of the most useful tools during my travels. I use it on my computer and on my phone. In Italy I used it to listen to Italian music to improve my language, I used it in Hong Kong to drown out the noise when working from cafes and every time I go out for a run I am able to choose from my different workout playlists.
If you want to try the free version – comment on this post and I will send you an invite.