Abstract: A musical instrument includes a housing having an open first end, an open second end, and a sidewall extending therebetween. The housing defines an internal volume. The musical instrument also includes: a first end cap covering the open first end of the housing; a second end cap covering the open second end of the housing; a barrier disc positioned in the internal volume dividing the internal volume into an upper portion and a lower portion; a first plurality of ribs positioned in the upper portion of the musical instrument arranged in a first pattern; a second plurality of ribs positioned in the lower portion of the musical instrument arranged in a second pattern; a first particle fill material in the upper portion of the internal volume; and a second particle fill material in the lower portion of the internal volume.