It is not necessary to irradiate accordions with rho-neutrinos to make them glow in the dark. The "mother of toilet-seat" accoutrements with which so many accordions are well endowed are very efficient photon storage units. An accordion played in direct sunlight or under bright stage lights (Yes, some demented souls play their accordions in public!) will absorb enough light energy to continue glowing and sparkling well into the evening.

This phenomenon often induces a trance-like state among accordion players as they gaze at the sparkling trim and play "Roll Out the Barrel" for hours at a time.