Karaoke Music is music that allows a person or persons to sing in place of the main singer. This allows the person to perform that song and sing in front of their friends, family, or talent show. With this being said, it’s safe to assume that the main vocals are not present in the song itself. However, those are not the only vocals in music. In almost all music songs, you have the main vocals and then you have the backup, background, vocals. Basically, the backup vocals are the backup singers or background singers to complement the main singer.
Therefore, in Karaoke music, the main vocals are taken out but the backup singers vocals are still left in since the person doing Karaoke is only singing the main vocals. So, this is why karaoke music is not pure instrumental music. Usually in karaoke music, you only have one singer, unless of course it is a duet, but you never have people sing as the background singers so that is why those vocals are not taken out.
I used to run an online karaoke retail store and we would get many complaints about karaoke music not being completely instrumental when they received it. From my previous explanation above, you can now understand why karaoke music is not pure instrumental music. » Read more: Karaoke Music versus Instrumental Music