The name of the band didn't tip you off? Or the lyrics to "Killer Queen?"
Lol. I was so naive, you wouldn’t believe it. They were from England where there is an actual queen (Elizabeth). I drew no sexual conclusions from the name (just as it never occurred to me to consider The Beatles insects or entomologists).
I’m not sure they had recorded Killer Queen at the time they were opening for ELO. Didn’t that tune come a bit later?
prancing around in ballet slippers and body suit should’ve been enough...