i use a site called
www.aimini.com
it is free and its like a site where people upload their music like cds or stuff for everyone to use freely.
this is where i get a majority of my albums and songs....
u have to make a account but its all free....just like here,yahoo,and my space and stuff.
its a really good site and when u download u can choose what music program to open it with
now idk if they have the instrumental...u would have to look
anyway i hope u find it.