Been remixing a TON as of late. Sorry about flooding the board. This one is a bit of a study in the usage of single/double track on the lead vocal to "boost" lines for impact. This technique goes back to the earliest days of recording and was used extensively by George Martin w/ Beatles tunes.
This piece, though, was modeled after a Prince song.
I didn't originally blend the additional vocals in, but I think it really does add quite a bit.