Hey, ive been really in to DJ mashups lately and I see that how they make most of it is mixing a capella versions of songs with the instrumentals. instrumetnals arn't that hard to find (Although if someone knew of a website that has the instrumentals of all the popular songs that would be helpful) but I am really stumped on where to find or make a cepella versions of songs for remixing and mashing up. SO where do i find these. I also have seen "vocal isolating programs" that somehow extracts the vocals from the instrumental so all you have is the vocals left. Do any of those programs actually work and how? PLEASE HELP!