Mystery Group

Here's a new one at MITTEN DRINNEN, a mysterious singing group, unknown to myself. Here they are, appearing on Hullabaloo, obviously singing a number that has some connection to meat or a butcher. I thought it might be Gary Lewis since the drummer seems to be the front man, but that guy just doesn't look like Lewis...and wasn't he always photographed with Buddy Holly-esque glasses?

UPDATE- HERE'S THE ANSWER