Free Midi Files Backing Tracks. They have loads of songs in a wide range of genres; M.i.d.i is an acronym musical instrument digital interface.
Over 70 genres/styles and 30,000 songs including mp3 backing tracks and midi karaoke versions. Blues midi file backing tracks. Download high quality midi files for singers, musicians, sequenced duo's, trio's, live bands and music producers.
Calypso midi file backing tracks.
As you can imagine midi files would work great for karaoke background tracks because of all the usual great features of midi. Hit trax midi karaoke files include embedded lyrics. Pop, rock, country professional midi file arrangements. Musicians using midi backing tracks had sound modules and drum machines.