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. Quadrilla’s Music Motion marble run set is crafted with high quality birch and rubber wood with metal xylophone keys for long-lasting musical marble fun! New 2013.