Does anybody know, how MJ was upgrading his songs during his lifetime? I mean, lets take a look on example. We have a song "Hollywood tonight". First demo of this song was recorded in 1999. Then MJ was worked on this song till 2008. But after his death Teddy Riley and other producers just picked his first demo and made their own mix with their music. But what about MJ's improvements... He was probably recording new demos of this song, new vocal part... So there is definately last demo version (made by MJ) somewhere...Another situation with Hold my hand, song was almost fully complete and released with MJ's last improvements....