The necklace breaks into two bands along front, which trail down to hook to a ring. From the ring is hooked a musical note, silvered edges, a small solar panel along front. It appears to generate a stasis field of sorts which keeps a liquid interior, visible but not directly touchable, from degrading. The nano-fluid inside is from Untitled, and when touched directly along front, sounds very much like him, though the tune it plays is much like a music box - notes only, simple, easy, triangles, squares, but recognizable.
~ If you must go, I wish you love; You'll never walk alone; Take care my love; Miss you love..; ~ expresses somewhere within the fluid, to a careful eye, lyrics scrolling as it plays.