As suggested by kikinovak as a slackdoc topic.

Basically, mplayer is a command-line music player packaged into most slackware installations. Because mplayer doesn't strictly require a desktop environment to be running, it is quite light and is ideal for wimpier machines such as netbooks.

$ mplayer ~/music/foo.mp3 # Tell mplayer to play your favourite song.

<code> $ mplayer ~/music/*.mp3 # Tell mplayer to play all of your mp3 files under your music directory. <code>

While running, mplayer can be controlled additional keyboard input.

Some simple but memorable shortcuts: spacebar - Toggles pause/play. return - Next track.

Don't accidentally hit the arrow keys while mplayer is running; It will alter the audio playback speed (quite annoying).