After finally coming to the U.S, Spotify became a very popular product. It is a no miss deal.
The thing here is that you get 6 months of free music streaming, with ads off course. You will have ads between playback and on the sides. I does not bother me though. After those six months, you will still be able to listen to music for free, but they will limit your time of streaming. They are trying to put you on a payment plan which is:

$5 Unlimited

• Listen to millions of tracks - all available instantly
• Unlimited music - no time limits
• No advertising
• Share tracks and playlists with your friends
• Play and organise your own music files
• Unlimited travel access

$9.99 Premium

• Unlimited music - listen to any track instantly
• Spotify on your cell phone - music wherever you are, online or offline
• No advertising
• Enhanced sound quality
• Offline mode
• Share your tracks and playlists with friends
• Play and organise your own music files
• Unlimited travel access

That being said Spotify is a great deal, and if you want to listen to music for free, then this program is ideal. To tell you the truth I have been using Spotify, and their ads don't bother me at all. They will play an ad like between every ten tracks that you listen. So it is not much. One thing though is that if you want to get an invite from Spotify then use facebook, not e-mail unless you absolutely have to. Here is the link to Spotify: Click Here.