It would be so cool if you can code with a guitar or a piano.

Ye it could be possible with sensors

Interesting idea. I think it's just a matter of turning MIDI instructions into some sort of syntax. Basically the reverse of some music making languages. I lack the know-how to implement it, but would gladly work on a project like that.

There is actually a guy playing Dark Souls with a guitar. Check out this https://youtu.be/uurIu4Fgy_Y

Somewhere i read about a programming language with music sheets

Or make music with keyboard

Isn't that... just... music??? Or you mean typing with a musical instrument?

@jpichardo here it is Velato http://www.velato.net/ the lang that uses midi files as source code

I had a discussion on a discord server recently about dance coding

Link a Kinect up and write some shit to recognize dance moves as code

@Elandor

Code with C#

@CrankyOldDev typing with a musical instrument.

Not sure if SonicPi is close to what you're looking for?

JFuge is a Java library that you can do this with