Not too sure about the first three, haven't heard them before. But I know for a fact that track 4 is Jakatta feeturing Seal - 'My Vision', released on Rulin in the UK and Badabing in Germany. I think that actual version you have is the Joey Negro club mix. His record label is Z Records, they maybe a couple of there I suspect.
You can buy 'My Vision' from www.juno.co.uk
, just search for Jakatta.