Abstract: A molded plastic guitar top has a sounding board with a circular sound hole located between its upper and lower ends. A plurality of integral circular reinforcing ribs concentrically arranged relative to the sound hole, project from the inner surface of the sounding board. Integral rectilinear ribs which intersect the circular ribs extend generally longitudinally of the guitar top and diverge from the circular ribs and relative to each other in the direction of the lower end of the guitar top. An integral liner projects from the inner surface of the sounding board and extends generally along the outer marginal portion of the sounding board. The guitar top is molded from thermosetting plastic sheet molding compound which comprises 40% glass and 60% resin. The sounding board portion of the top essentially comprises a mat of random glass fibers ranging in length from three inches to two feet. The reinforcing ribs or braces are formed by random chopped glass fibers not greater than one-half inch in length.