OLympic 7- oh oh, oh oh (what musical is this from?)

[Briny_Deep]

What’s that number you’re calling?

Can anybody identify this? The Googles, they do nothing.

OLympic 7-0000,
OLympic 7-0000.
What’s that number you’re calling?
I said, OLympic 7, oh oh, oh oh!

Terribly sorry, there must be some mistake, dear.
There’s no such number in this hemisphere!
The telephone company’s gotta be nuts!
OLympic 7-0000,

[etc.]