Elementary school music education! You know, that horrifyingly boring thing that you couldn't wait to be done with! (Other opinions may vary but are wrong.)
The thing about teaching elementary school music is that you need to give every student a musical instrument. And these are young kids, whose three hobbies are forgetting things, accidentally breaking things, and deliberately breaking things. Which means your ideal musical instrument is:
Capable of producing musical notes people would want to hear (optional)
And to fill all of these needs, in the mid-1940s John Albert Flutophone created and trademarked the musical instrument that would bear his name.
(No, I will never get tired of saying that every invention was invented by someone with the same last name.)
A flutophone is kind of like a recorder that's been the victim of a ruthless usability study. It has exactly seven small holes for easy fingering (that is not what she said, come on, we have an essay to get through). It is tuned to the key of C, the most inoffensive and basic of all the keys. It does not require any maintenance more complex than occasionally cleaning it in soapy water and assembling it involves inserting the mouthpiece part and making sure it lines up with the holes.
But mostly it is made of plastic and costs four dollars.
(Today's draw really did screw up in all sorts of ways, huh? The shading was a valiant effort and I'm not ashamed of trying my best with a smudge stick, but I'm pretty sure the flared part at the bottom would produce at best something that could be described as "prank music".)
Put all of the flutophone's advantages together, add a music teacher, and you've got a classroom full of 28 second-graders playing Three Blind Mice in what a very generous person might call unison. Really, bring a case of flutophones into any schoolroom and the music teaches itself.