There could be a very simple way of doing this that i'm missing but here are some things you could try that may or may not work.
If you have a mac you can use a free nifty little program called soundflower. it will let you rout audio from the output of one program into the input of another. (out of your media player and into garage band)to change the output of your media player, download another nifty app called detour.
Warning: I might not have a clue what im talking about here, but what the hell.
on a PC you can rip the DVD - im not sure if this will work because I have never used the app - and drop the appropriate flie into windows movie maker, where it possibly will seperate audio from the film? then you just can just export the audio.
Id be interested to know how other people would go about it...
I have not seen this question posed before. It is: Is there a way (maybe special software) to take a music concert DVD and somehow convert just the music portion to be recorded and burned to a CD for listening to in my car? I have several live concert DVD's that I would love to take just the music from it and create a CD for listening in my car or any CD player. Is this even possible?