If you’re like me, you’ve been using XMMS for music playback since just about forever. It’s ancient, though. It uses GTK1, and since Thomas Klausner is trying to get GTK1 dependencies out of pkgsrc, he listed a roundup of alternatives on the pkgsrc-users mailing list, most/all of which are in pkgsrc. Pouya Tafti added some more.
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I would recommend DeaDBeeF ( http://deadbeef.sf.net ) if you prefer graphical interface, or cmus if you prefer cli.
I would recommended to try it too.