In 1977, the UK charts welcomed a really weird dance cut into their top 10: The Crunch, by the Rah Band. When the single's success propelled the "band" into the pop TV circuit, they were forced to improvise their appearance.
Perhaps the masks were employed because "Rah" simply stands for Richard Anthony Hewsen and there was no band at all. Just one very talented veteran session composer who knew his way around a stack of vintage synths well enough to pull off a album's worth of material by himself.
Hewsen had made his first big musical mark in an ignominious fashion: he arranged the strings that broke up The Beatles. Phil Specter tapped him for those legendary Long and Winding Road overdub sessions and one can imagine him motioning towards the strings with an expensive handgun held to his head.
The Rah Band went on to produce a few more dance hits in the decade to follow, but none with such brilliant timbral wrongness as The Crunch. In a stroke of sonic self-flagellation it says, "I'm sorry for what I did."