License information for Classroom Music Teaching Aid Last updated: 2016-10-1 1. The concept and design are in the public domain. 2. The software makes use of Teensy and Arduino libraries which are documented in the relevant code files. Any code written by me excluding copyrighted libraries is in the public domain. 3. Parts of the electrical schematics and images have been taken from and belong to the Teensy website: https://www.pjrc.com/