Abstract: The instrument includes a support structure formed of telescoping legs enabling height adjustment of the bed supporting the bars. The bars are strung on lines supported on bar mounts having resilient material in engagement with the lines preventing transmission of vibration from the bars to adjacent bars and to the support structure. A dampening rail including a fluid-filled bladder extends the length of the instrument in underlying relation to the adjacent inner ends of the two rows of bars and is spring-biased into engagement with the bars. A pedal, selectively displaceable along a longitudinal support bar, is used to engage and disengage the bladder relative to the bars. The pedal includes a fulcrum assembly for adjustment of the feel of the pedal.

Abstract: A tuning means for the resonators of keyboard percussion instruments, particularly the lower note resonators of marimbas. A threaded cap and collar provide pitch adjustment while a holding means maintains the adjustment so that vibration buzzing of the adjusting parts is prevented.

Abstract: A support assembly for a marimba or other keyboard percussion instrument that provides quick and easy adjustment of the height of the keyboard to accommodate a player's personal preference or to accommodate different playing heights required by different players.

Abstract: A drum hoop for a musical drum, at times referred to as a "counter hoop," which hoop includes a reinforcing channel member and a reinforcing rim. The drum counter hoop retains a drum head with an associated locking member, or ring, by fastening lugs or the like secured to the drum shell and by suitable fastening means such as threaded bolts with nut-type heads thereon, sometimes referred to as tension screws, or rods, which engage with the hoop. The lugs are internally threaded or provided with extensions for threads to engage with the bolts. The drum hoop and drum shell are, therefore, provided with means for adjusting or changing the tension of the drum head by tightening or loosening the bolts which changes the position of the hoop and the drum head locking member with respect to the drum shell. The reinforced construction permits the drum head to be provided with a very high tension without bending or breaking the drum hoop.