Abstract: A musical bar for a musical instrument includes a striking surface and a back surface which is a back side of the musical bar from the striking surface. When the striking surface is struck, the musical bar is vibrated to produce a musical tone with a unique pitch as a pitch of a fundamental tone. A recess is formed in the musical bar so as to be recessed from the back surface toward the striking surface. A position of a node of vibration of the fundamental tone for the musical bar is substantially aligned with an imaginary center of gravity of the recess in a longitudinal direction of the musical bar.

Abstract: A musical bar for a musical instrument includes a striking surface and a back surface which is a back side of the musical bar from the striking surface. When the striking surface is struck, the musical bar is vibrated to produce a musical tone with a unique pitch as a pitch of a fundamental tone. A recess is formed in the musical bar so as to be recessed from the back surface toward the striking surface. A position of a node of vibration of the fundamental tone for the musical bar is substantially aligned with an imaginary center of gravity of the recess in a longitudinal direction of the musical bar.

Abstract: In an acoustic sheet which can be used as a head material of a percussion instrument or a head material for a sound box of a string instrument, a plurality of change regions having a crystalline orientation different from a base are dispersed into the base made of a synthetic resin sheet having a uniform crystalline orientation. The acoustic sheet can include a delamination which is formed by delaminating the synthetic resin sheet in a thickness direction.