It isn`t common but sometimes what is most interesting in a DVD isn`t the images but the sound, so for this you need a tool like Acala DVD Audio Ripper. It is a utility that lets you rip the audio from any DVD directly to an audio format.
In the Acala DVD Audio Ripper process there is no loss of quality from the original DVD. You can select which audio from a chapter of the DVD you want to rip. It also comes equipped with editing tools that let you select the exact fragment you want.
Once ripped Acala DVD Audio Ripper lets you save it in MP3, WMA, WAV, etc formats.