All I can add to the replies above, is the following:
- Yes, a variant song called "Four Blind Mice" was performed by a couple of Sesame Street Muppets (I think it was Bert and Ernie, but might be wrong there) during the first season.
- Yes, the "16 Samba" song exists (I've seen it on PBS, though that was 20-odd years ago). Some of the lyrics I recall:
[ballad-like guitar intro by the lead vocalist Muppet, moderate tempo]
He was a 1 from the country
She was a 6 from the town
He fell in love when he saw her
Wearing her beautiful gown...
[forgotten line here]
It was a time for romance
They made a brand-new number
When they began to--dance!
[music becomes a lively samba tune from here on; the Muppetized digits of "16" move closer together and start dancing]
16...you know what I mean
Just 1 and 6, with nothing between
16, what a heavenly number [singer pronounces it "numbah"]
So great for adding, subtracting, and counting, and doing the samba
16, my carnival queen
You're more to me than [?], and less than 18... [the missing word is a number, but I forget which]
Hope this helps a little, at least!