How do I extract or remove vocals (lyrics) from music?
Use Effect | Stereo | Reduce Vocals or Effect | Stereo | Stereo Center. These effects only work in stereo files when the vocals are exactly the same in both the left and right channels. Most modern recordings apply some stereo effects to the vocals, making complete extraction or removal impossible. A detailed tutorial can be found here. Related information can be found in the forum here and here. To save yourself a lot of time and effort, search for a karaoke version of the song first. iTunes has karaoke versions of many popular songs.