Finally, Daddy Types has solved one of the greatest mysteries of parenting! Finally, as in, actually, it was solved last fall, but I only realized it yesterday:
The music from that Sesame Street Crayon Movie was all written and performed by Martin Harvey: The first and last segments with the girl damn near poking her eye out with that crayon are Harvey's "Dragonfly Dance," which was originally called "Water Course." The lively finger exercise in the middle, inside the factory--which was the mystery when I emailed Harvey's studio in 2008--turns out to be a piece called "Exchange."
Since getting linked online to the Sesame Street clip, Harvey had apparently been fielding inquiries about the songs, so he included digitally remastered versions from his original masters on his latest release, Richard Harvey's Nifty Digits, which hit iTunes last fall.
Only, I didn't actually click through to confirm "Exchange" was the piece until yesterday, after DT commenter Jonas did. I did, and it is. Now that that's cleared up, I'm pretty sure I can just put the rest of this dad thing on cruise control.