Like any concrete construction, it's better with rocks... 😀
Music with rocks in
Before the universe began, there was a sound. It went: "One, two, ONE, two, three, four..." The Listening Monks discovered this, and it explains a lot. The cataclysmic power chord that followed was the creation of time and space and matter and it does Not Fade Away.
A long time later (on the Discworld's timeline) something flashed across the Disc's surface looking for the magic that could give it life and expression. It found a wall just behind Unseen University, and then there had always been a second-hand music shop there. The new shop (which had always been there) contained an irascible proprietress, a lot of junk, and a strange instrument in the shape of a crude guitar. The strange guitar contained The Music. All it wanted was a way out.
