The Color of Music
Moody offers a different way to categorize your music collection. Using color-coded tagging, this app lets you categorize your iTunes music based on the “mood” of the song. Horizontally, the scale goes from sad to happy, and vertically the scale goes from calm to intense.
When you listen to a song, you rate it using Moody, which launches in a small floating window on your screen outside of the iTunes application. After your songs are tagged, you can then play music based on your mood.