STAN FREBERG HIT "John and Marsha"

"John and Marsha" is a 1951 American novelty comedy single written and performed by Stan Freberg and released on Capitol Records. Consisting of only two words: "John" and "Marsha", the recording is a back-and-forth dialogue between a man and a woman ranging in varied emotion.

https://en.wikipedia.org/wiki/John_and_Marsha

In Freberg's 1951 hit "John and Marsha" (he did both voices).