A string musical instrument, such as but not limited to a guitar, whose sides are angled; and without relief holes in the instrument's soundboard, or top; with the absence of a hole on the instrument's top that allows more sound to be produced by the remaining material in the top, where the sound hole might have been; whose relief holes are located on the “inner back” which is attached to the angled sides; that embodies a second, or “outer back,” identically contoured or shaped like the inner back but whose outer dimensions are equal to the outer dimensions of the instrument's top, with a sound chamber created by the proximity of the inner back with the outer back, whose outer back embodies a shaped flange designed to direct the instrument's sound forward, and embodies a series of springs attached to both the bridge plate and inner back of the instrument, designed to create a reverb effect.