I seem to remember Mary stating in "Supreme Faith" that she recorded the full track, and then they decided to add Scherrie. IMO the track works as it is, and I think a full Scherrie lead would have done just as well on the charts. While I think Mary does better vocals on "Floy Joy", the trade off between Mary and Scherrie is much smoother than Mary and Jean. Finally, the lyrics are a bit generic, but it is a good dance track, which I think was the intention at the time.