To listen to sound (Ogg, ?MP3, .au files, CDs etc) on your sound card, you need to:

You can install too e.g. Sound/Audio apps or Applications using MAD, 'xfreecd' (music CD playing software), 'mp3blaster' (full-screen console mp3-player), or 'saytime' (if you have no CD drive and no ?MP3s). Try to run them as root (it should work). With Debian, ordinary users lack permission to read the CD drive and write to the audio device (usually /dev/dsp), and they probably can't use these programs (yet; see next paragraph).

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