I think it was a variety program, maybe the “Smothers Brothers.” Here goes:
Doo da-doo doo doooooo doooooo
Doo da-doo doo doo da-doo-doo
If that’s got good enough, give me a call. I’ll whistle it for you.
Bingo! Many thanks. That tune was running through my head all day yesterday, and I couldn’t pin it down for sure.