I'm afraid the only way that can be done is on a multi-track recording not on an mp3/ cds. Right now this is only available on files with individually recorded tracks inside an audio container. An mp3 file simply blends those tracks into one and so if you're going to edit out anything, it will be everything. Like BGM and Vocals together. Hope that made sense.
I think you can find some video/audio converter softwares ,maybe they can help you to solve the problems, you can search on the web,there are many video/audio converter softwares. And I can recommend Xilisoft Video Converter 3.1 ,you can have a try.