So I dug out the Japan '81 DVD I'd downloaded awhile ago but never got around to watching, and sure enough, all the background vocals were taped. Perry's lead vocals were live, but when they got to the chorus of "Wheel In The Sky," even his main melody line was recorded, and it looked pretty silly when he held the microphone out to the audience and you could still hear his voice.
So my question is...how did they do this in the pre-digital age? Did Steve Smith just have a click track even back then? Or did they take the time to "clean up" the show just for the Japanese TV broadcast? I was just kinda surprised that they were using taped backing vocals way back then. Even my fav. melodic band Toto only started doing that within the last 6-7 years. I just thought it was amusing.