wmmp3 is a mp3 player dock app for windowmaker; frontend to mpg123.
It is a small X application that will also work as a windowmaker dock app.
All user options are contained in a config file, ~/.wmmp3 . There is a sample.wmmp3 file in the distribution that can be used as an example/template.
Basically, enter in the config file any directories that contain mp3 files and wmmp3 right now will play all the files in each directory sequentially when you press play. You can select which directory to start with by using the up/down buttons in the left frame when the player is stopped.
Pressing the "infinity" button will cause the player to repeat the songs in the current directory instead of just playing them once. Pressing the "random" (R) button will cause the player to randomly select songs from the current directory.