Found what I think is a new manufacturer of karaoke songs "DMX" they are available from CustomBurn but can be individually downloaded per track and are available in mp3+g or video formats Seems to be mainly the newer music but the few I've tried sound quite good, here is the link: https://www.customburn.com/cat/search.php?mf=DM.
Another what seems to be a new download distributor is : http://www.mrentertainer.co.uk/
They are various brands not jus Mr Entertainer.