I saw Frank on the Them or US tour in Atlanta about '85. I say I saw them, the lights were so dim and purple you could barely make out what they were doing. Frank I think just conducted and didn't play. I really liked when they did Whipping Post for an encore. I had seen REM the year before and they had the same kind of dim purple lighting.
Disco Boy was my favorite song on the album. I probably don't have to tell you anything about the band, that's Terry Bozzio on drums. He was also the drummer for Missing Persons and was married to the singer Dale Bozzio.
Frank Zappa - Disco Boy - YouTube