This just made me seriously happy:
I was showing you Sesame Street videos on YouTube while you were in your highchair, trying to distract you enough to eat ANYTHING (you've been sick, you're no longer into food), and I came across this video. The song came flooding back to me almost immediately, and when the chorus started, I practically flew out of my chair in a joyous, melodic movement.
"AND WE SING IN HAR-MON-EEEEEEEEEEEEE!"
These kids must be like 50 now.