One of my usual "weekend gig" rants - Sat. night, we split the bill with another band who played first. Throughout their set, they would occasionally launch into a chorus or a refrain, and suddenly, there seemed to be female backup singers. They were using pre-recorded voices from some of their studio work. It sounded good, but it bothered me as an ardent supporter of LIVE music where a human controls the modulation, pitch, rhythm, et al. I also thought it could be a slippery slope. I'd be interested to hear any reactions from anyone, live performer or not, pro/amateur.