audacious
An open-source audio player.
TLDR
Launch the program
$ audacious
Enqueue a specific directory of audio files
$ audacious --enqueue [path/to/directory]
Start or stop playback
$ audacious --play-pause
Skip forwards or backwards in the playlist
$ audacious --[fwd|rew]
Stop playback
$ audacious --stop
Start a headless version
$ audacious --headless
Exit as soon as playback stops or there is nothing to playback
$ audacious --quit-after-play