I have no idea who they were. I don't remember the name of the act. It was two guys and two girls who sang, plus the drummer. I'm pretty sure they were touring around nationally, with their own FOH and Monitor engineers, so it was an easy gig for me. In fact, I don't think they were American (maybe Australian, but don't quote me on that one)
One of the the guys played
acoustic guitar (even when there was electric in the mix) and the other guy stood in front of a keyboard that wasn't even on (although we hooked it up through some DIs so it looked real on stage). What really got me was the bass in the mix, yet mysteriously no bass on stage.
Were the tracks you did real instruments or MIDI?
*edit*I found the press release from last year's season, looks like the revue was just called "Abba Celebration." People loved the show though.*edit*