But maybe you would find the number worked better in the stage version if it had been retained as a duet between Sally and the M.C., rather than as a number for the M.C. with the women's chorus.
The problem is, at this point in the show, Sally isn't working at the club. So it would be rather hard for her to be performing a duet there with the MC...;-)
...which is, I'm sure, why she doesn't sing it in the show context. ;-)