As stated above the Motown Original Artist series. These are actually made by Singing Machine, and are CD+G's. Songs come both with or without lead vocals.
There are also Original Footage VCD's. This is a twelve disc set of older music, original videos of the original artist. This is a multiplex set, so the vocals can be removed. When I do private parties for people around 50 years old or older, everybody loves them.
Billboard makes a top 10 series, which has original music and vocals, and versions without.
K-Tel also makes some disc that are original artist music and leads, with versions without leads.
Felix the KJ