Admirably goofy example of actually making a real thing from an idea. And a little flourish with the wiring goes a long way for well dressed presentation.

...I guess I'm appreciating being confronted with how rarely I remember that motors are generators...

Whoa, this is the coolest idea I’ve seen in a long time. Simplicity and creativity. Will be building one with my 6yo: great lessons about reusing parts, concepts behind making electricity, basic electronics and an opportunity to introduce the honorable 555.
Hardest part will be the wood veneer, a nice touch! 

Thanks for sharing. 

:-D that made me chuckle! Awesome! You crazy person you :-D

Good idea and cool instrument ...

..but there is a drawback the generator is at least as loud as the instrument itself

fdufnews, see what happens when I amplify the sound!  I could do a recital in big stadiums, although I should practice a little more. haha https://youtu.be/jFdNWro2dUU 

With the amplifier it sounds a bit like a bagpipe.

Sure, a little more practice will help.

May I suggest using pots instead of fixed resistor to tune the acordeonador.

This is really a cool idea of using an cd player mechanism like a harmonium  

I love how you wired the circuit in a spiral wire design kind of like a bomb which makes the project look even more attractive 😀 !

Thanks Rudraksha! I had to find a nice solution to generate the bridges! :)