There is an _awesome_ collection of Capsoul tracks out on Numero. If you're unfamiliar with the Numero label, they do reissues of great stuff like this, by buying entire catalogues of master recordings from defunct labels. They release a lot of soul and r&b, but also latin, jazz, and world music, and they do an incredible job.
You can get some of these tracks through iTunes, but it's worth getting the CD's or even better the LP's-- great liner notes and extras.
GJ