[LAU] .AVI to music file

[millward]

 How do you strip the audio track from an .AVI file ?
 I'd like the resulting audio track to be burned onto an audio CD.
 The only good thing about the .AVI video file is the audio track.
  This is on a LInux Ubuntu or Slackware system with a half-gig
  of memory.  I'd upgrade the memory but this machine is getting
  too old to throw money at. I'd rather save to get a new machine
  sometime this fall.