Cheetah were a female duo (sisters Chrissie and Lindsay Hammond) who would now be classified as “rock chicks,” but back then were “the two girls on Countdown.”
The main reason for “Spend The Night” (1980) being here is the bit at the end of each chorus (first appearing at the 48-second mark): it’s a descending riff on the guitar, and it’s glorious.
Incidentally, the song was written and produced by the amazingly productive duo, Harry Vanda and George Young. Not only that, the pair wrote and produced the entire album that the song appeared on, 1981’s Rock and Rock Women, the only album Cheetah released.
Here’s the original (non-Countdown) film clip:
And here are Chrissie and Lyndsay performing the song a couple of years ago at the 2007 Countdown Spectacular: