Abstract: A composite structure for a stringed musical instrument or an acoustic guitar. The stringed instrument structure having a one piece neck and body cast of a fiber reinforced single resin matrix. Encapsulated are continuous longitudinal fibers which extend distal to the bridge and nut, encircle the periphery of the neck, intermediately connect the peripheral matrix, and which surround the longitudinal fibers integral with the body and head of the instrument. The acoustic guitar having a fiber reinforced single resin matrix, of which the acoustic chamber is not integral to the region below the playing surface such that the neck does not increase in overall depth until the end of the playing surface.