Music Motion turns up the volume on classic Quadrilla marble runs by combining strategically-placed musical chimes with wooden rails and blocks. Music Motion by Quadrilla adds a musical element to the marble run formula. Music Motion includes little xylophone keys built into different building pieces, so marble run builders can get even more creative with their constructions. Set them up in crazy ways, or why not try having marbles play a tune as they roll down the raceways? Quadrilla's Music Motion can be combined seamlessly with Quadrilla's other marble run sets.