Who has spend so many time to extract MP3 song without vocal from a Karaoke CD? Skip the troublesome methods to open your Karaoke song from your Karaoke Player TV set to record song manually using any recorders you have.
Audacity is a free to use audio editor for recording, slicing, and mixing audio. Convert your Karaoke Video in any formats to MP3 format first, then you can add to import your MP3 file to Audacity, over there you can adjust the L and R to get your karaoke song to identify which side has no vocal. Once you found the side, click on File to Export as MP3.
For Windows XP user, Sound Recorder can only record sound up to 60 seconds. Audacity can solve this problem to help you record in a longer period.