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Full user review
The Online streaming is great & it finds music in your computer easily. Also you can reveal where a song is stored on your computer.
You can't change/add album artwork. Get stuck syncing your iPod at times. Ads.
Spotify is a terrific application. I think in the future they'll work out all the flaws & cons in the app. But otherwise, it is better than iTunes. Has a cool appealing green logo :P