From The Lawrence Welk Show (c. late 1950s), and about as creepy as it gets. Read about the Lennon Sisters’ stalker-related tragedy HERE.
The Lennon sisters with Lawrence Welk, c. late 1950s
the lennon sisters – you always hurt the one you love
fleurmach
beyond your peripheral vision
fleurmach 
Fascinating story. Never heard of them until now