It is a very light program with which we can play MP3, OGG, WMA, FLAC and playlists in M3U format. The application is almost totally controlled with the keyboard and offers compatibility with the "Now Listening" function included in the Windows Live Messenger and Yahoo! Messenger instant messenger clients.
Its interface is very simple, and it will only show the information of the song, its length and a graphic representation of the sound through a parametric equalizer.
If you are looking for a player that can be launched from your pendrive, that hardly uses any resources and totally free, you have to try PsyMP3.