mpThreePO is for playing MP3 files kept under the My Music folder, or some other folder organized in a similar hierarchal manner. It was developed for quick and easy playing only, not (yet) suitable for creating/maintaining libraries, mixes, or permanent playlists. It works very well for its intended purpose, especially if you like radiolike play of your favorite music, but without commercials. The application offers random play of either single songs or entire folder contents (CD), repeat playlist, list manipulation, and file searching options. It's very intuitive, and most operations are performed with a single mouse click, and it also features control-tip/tool-tip/roll-over help for everything.