If you’re of a certain age and grew up watching Sesame Street, you count to twelve to a funky, jazzy, surprisingly complex tune (sung by The Pointer Sisters) that accompanies a trippy pinball animation, aka “Pinball Number Count”. Charles Cornell, who analyzes and explains musical concepts on YouTube, uses music theory to break down the tune’s odd time signature and unexpectedly intricate melody. The deeper Cornell dives into the song, the crazier it seems that this masterpiece of music was written for a children’s television show. It certainly made it memorable—it manages to live rent-free in my head, 40-plus years on!

(Watch all 11 versions—yes, 2 through 12; there is no 1.)