They also serve who only stand and sing
Well, on EKN at least I've had no takers for my "Only Connect" challenge. I've had some over on Facebook, where I've been serialising it.
The connection between the sets of clues , as I'm sure you all knew really (!), is uncredited backing vocalists. So Petula Clark is an uncredited backing singer on Give Peace A Chance, Neil Diamond sings on Itsy-Bitsy Teeny-Weeny Yellow Polka-Dot Bikini, Tina Turner and the Ikettes sing the backing vocals on Montana (and elsewhere on Over-nite Sensation), while Sting provides the "I want my MTV" lines on Money For Nothing. None are credited, though there's no great secret about their involvement either.