A idiophone assembly for attachment to a rim or side of a drum comprising a idiophone, one or more quick release drum rim clamps and one or more fasteners and, as applicable, associated bosses for securing the clamps to the instrument is described. Advantageously, the assembly can be easily secured to the rim of a drum and easily removed from the drum as desired. In some variations, rubber insulating spacers are provided that at least partially acoustically isolate the instrument from the drum. The assembly is often positioned where it can be struck independently or in unison with the drum head to produce a rimshot or cross stick. A flexible drum stick is also described having two striking ends and a movable handle.