Respect screams Zayra to me, Charo accent/Bjork vocal slides and all.
I can't remember the Depeche Mode song (although I'm sure I'll know it when I hear it), but I'll go with Jill, with her having done the Evanescence earlier.
Shooting Star - Josh or Ryan, whichever one is the "soul" guy. I still can't remember which is which (I only realized they were two different people a couple of weeks ago).
I certainly hope the sharp ax refers to cutting Zayra loose with a vengeance. but I'm not holding my breath.