Not sure man, but track 4 sounds like a remix of ‘Can’t Help Myself’ by 2 Brothers on the 4th Floor.

http://www.youtube.com/watch?v=64ueatTzIiU

Not sure about the other 2 dude, but hope this helps a little…

Bollocks! Not sure then dude, good sample to use back in the day I guess, but if it was used on a number of tracks then it’s gonna be a fuckin’ nightmare trying to find one particular one. Good luck with ya search though man & welcome to partyvibe. Stick around dude, someone should be able to come up with an answer for you eventually.