In 1979, disco was all the rage. For all the kids who had never bothered to pay attention when their parents would talk about it, it was sort of like dubstep. It was ubiquitous on the radio and even rock bands were vying to get in on the action so they didn't get left behind in the new revolution. Sort of like how Korn did that album with Skrillex, only a little bit less horrible.
Even punk bands were reluctantly dragged into it. In 1978, Johnny Rotten launched his post-punk band Public Image Ltd., which, for all its punk cred, did employ a number of disco beats. Around the same time, two of the biggest rock bands in the world were planning new records and silently plotting to work on their own disco singles.
Those bands? Pink Floyd and KISS. And oh boy, what those plans wound up wreaking.