Well, more than 40 years ago, I listened to the LHS - The Les Humphries Singers - songs like Mexico, Mama Loo, Kansas City, etc.! I was even a fanclub leader.
This was in the seventies:
L.: With Les Humphries, R.: With John Lawton (later Uriah Heep) in Cologne (Tanzbrunnen, Köln, around 1977)
With Jimmy Bilsbury (Babalu, Bern, around 1976)
Two LHS Fanclub Leaders: Thomas Mäder (Bern), Horst Weilacher (Pforzheim),