Check out this cool MaKey-MaKey PicoBoard Scratch Trumpet from Josh Burker:

I have been working on programming an electronic trumpet in Scratch. I am using a MaKey MaKey and a PicoBoard for the hardware side of this project. Here is the Scratch code I devised. You can download the project from my Scratch projects page. 

Scratch reads the PicoBoard’s sound sensor to determine if I am blowing on the microphone. For some notes, which use all open valves on the trumpet, I have added a fourth key that the MaKey MaKey reads. Additionally, the PicoBoard reads how hard I am blowing on the microphone, so Scratch will play a low B flat, an F, or a high B flat.

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Every Monday is Makey Makey™ Monday here at Adafruit! The MaKey MaKey – by Jay Silver and Eric Rosenbaum, made by JoyLabz! Ever played Mario on Play-Doh or Piano on Bananas? Alligator clip the Internet to Your World. MaKey MaKey is an invention kit for the 21st century. Find out more details at makeymakey.com or watch the video at makeymakey.com. Turn everyday objects into touchpads and combine them with the internet. It’s a simple Invention Kit for Beginners and Experts doing art, engineering, and everything in between! If you have a cool project you’ve made with your Makey Makey be sure to send it in to be featured here!