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This application feels like a Mac application, even on Windows (but don't worry -- it doesn't run like a Mac application on Windows!). It has a similar feel to iTunes, so many will feel well adjusted. Your social network's friends are on the left, if you choose to connect to it. New releases you might be interested in allows you to keep up with the music scene.
To the left and the bottom, you can see the music controls which light up when music is flowing through the application.
For more on Spotify, read the corresponding post on the ZDNet iGeneration column.