An '80s what now?
an erstwhile pop combo of the 80s
That "pop combo" was the fifth most-successful UK rock band of all time, and the song in question comes from the first album to sell a million copies on CD. Though you did give them an "erstwhile", which (at least in one sense) is something of an acknowledgement.
(They're also really "of the '70s, '80s, and '90s", but I'll let that slide.)