A guitar, comprising: a guitar body, comprising: a guitar side; a neck support-fingerboard brace unit comprising a neck support and a fingerboard brace fixedly attached to each other, wherein the fingerboard brace has an elongated body with a brace surface and two ends, and the fingerboard brace is attached to the guitar side at the two ends, and the neck support comprises: a top portion, a front surface and two sides, wherein the fingerboard brace extends from the front surface; wherein the top portion of the neck support and the brace surface of the fingerboard brace form a top surface of the neck support-fingerboard brace unit; a guitar top attached to the guitar side to form a sound box, wherein the inner surface of the guitar top is attached to the top surface of the neck support-fingerboard brace unit, and each side of the top portion is formed at an angle relative to a longitudinal axis of the guitar body; and a guitar neck attached to the top portion of the neck-support-fingerboard brace unit, the guitar being characterized in that the guitar body further comprises two support structures (336, 350) comprising top surfaces and attached to the guitar side, wherein the two ends of the fingerboard brace rest on the top surfaces of said support structures. a guitar side; a neck support-fingerboard brace unit comprising a neck support and a fingerboard brace fixedly attached to each other, wherein the fingerboard brace has an elongated body with a brace surface and two ends, and the fingerboard brace is attached to the guitar side at the two ends, and the neck support comprises: a top portion, a front surface and two sides, wherein the fingerboard brace extends from the front surface; wherein the top portion of the neck support and the brace surface of the fingerboard brace form a top surface of the neck support-fingerboard brace unit; a guitar top attached to the guitar side to form a sound box, wherein the inner surface of the guitar top is attached to the top surface of the neck support-fingerboard brace unit, and each side of the top portion is formed at an angle relative to a longitudinal axis of the guitar body; and a guitar neck attached to the top portion of the neck-support-fingerboard brace unit, the guitar being characterized in that the guitar body further comprises two support structures (336, 350) comprising top surfaces and attached to the guitar side, wherein the two ends of the fingerboard brace rest on the top surfaces of said support structures. a top portion, a front surface and two sides, wherein the fingerboard brace extends from the front surface; wherein the top portion of the neck support and the brace surface of the fingerboard brace form a top surface of the neck support-fingerboard brace unit; a guitar top attached to the guitar side to form a sound box, wherein the inner surface of the guitar top is attached to the top surface of the neck support-fingerboard brace unit, and each side of the top portion is formed at an angle relative to a longitudinal axis of the guitar body; and a guitar neck attached to the top portion of the neck-support-fingerboard brace unit, the guitar being characterized in that the guitar body further comprises two support structures (336, 350) comprising top surfaces and attached to the guitar side, wherein the two ends of the fingerboard brace rest on the top surfaces of said support structures.