What is the name of the Oldies song that has "do do do do, doot do, do do do do...do do do do, doot do, do do?

I can't get it out of my head, it's a short little tid bit. I can hear
it on the piano and can hear it sung. I think it's sung in the song by
guys in their falsetto voice. The notes on the keyboard may be:
C-D-D-E-E, G-C, D-D-E-E...C-D-D-E-E, G-C, E-E (I think)