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Sometimes you want to listen to music to set a particular mood, and Moodagent is a great app that scans your music library on the TouchPad and then builds a playlist to match your current mood. It is does this by using some preset criteria to match each song in the library, and then building a playlist based on a seed song that you give it by tapping on the screen. The diferent criteria can be manually adjusted to further refine the playlist to match your desires. Free.