Looking for a famous sketch ft. a singing quintet

Hi everyone,
I live in the Netherlands, and in comparison to my fellow countrymen I think I can say I'm pretty well versed when it comes to English comedy. A question a colleague came up with had me completely stumped though.
She is looking for a sketch / scene in which a quintet of singing men (she thought they were five) are singing.
The least tallest of the men never once seems to be able to join in at the correct time.
She thinks it's something from the seventies. Sorry, the details are a bit hazy.
Does anyone know what this can be?

Sounds a bit like a Morecambe and Wise sketch I saw recently.

This one. https://www.youtube.com/watch?v=xPZl4bhOTAA

Boom oo yatata ta!

Excellent!