This is the laserharp that I made as an intern project when I worked at National Instruments.
Using a myRIO as hardware, this is a harp with lasers for strings which accepts MIDI files and plays songs.
Here is a link to full documentation for the project: https://forums.ni.com/t5/myRIO-Student-Projects/myLaserHarp-Music-with-strings-of-light/ta-p/3606702?profile.language=en