Abstract: A semi-acoustic electric guitar comprises a left body member, a center body member, and a right body member, a left megaphone port is formed in the left body member, a center acoustic chamber is formed at a first end of the center body member, a right acoustic chamber is formed in the right body member at a first end, a right megaphone port is formed in the right body member, the left and right body members are joined to the center body member, the left and right megaphone ports communicate with the center acoustic chamber such that sound generated inside the center acoustic chamber is amplified by the right and left megaphone ports. A bridge is fastened to the left and right body members, two electric pickups are fastened to the center body member, a neck is formed at a second end of the center body member, a tone control hole, a volume control hole, and a pickup switch hole are sized to receive a tone control, volume control and pickup switch respectively.

Abstract: A stringed musical instrument such as an acoustic guitar, a mandolin, a ukulele and a violin has a body and a neck protruding away from the body. The body comprises an upper sounding board, a lower sounding board and a side wall. Strings are tensioned between the neck and the body. A concave depression is formed in the body so as to extend from the upper sounding board towards at least one of the opposite sides of the side wall with the neck therebetween to facilitate pressing or stoping the strings positioned on the body.