These work on a game mechanic where redstone ore will activate randomly when an armor stand is place on top of it, taking a signal with an observer and sending it to a note block and lamp. The notes can be tuned however you like, in the download I've used an exotic Raga Asavari scale just for fun. The result is an occasional pleasant melodic tinkling of notes. The lamps are optional but add a nice touch. These can be expanded or shrunk down if needed and a version is possible that would increase the frequency of notes.