The Gilyr is a popular musical instrument. It consists of up to 128 laser sensors connected to a build-in synthesizer. The interruptions of the beams with a hand or bow produce sounds, with the duration and frequency depending upon the timing and location of the interruptions. 
What is unknown is who originally created the Gilyr... Was it humans or non-humans? Did it originally serve a ritualistic role? Why does it resemble many stringed Terran instruments?