Walnut Grand Auditorium Baritone This baritone-scale custom guitar features our trademark Grand Auditorium body shape, comprised of all-solid AA-level walnut for the back, sides, and top. A pair of octave strings on the 3rd and 4th baritone strings adds a splash of high-end color. For visual touches, this deep-voiced baritone has been appointed with our Bouquet fretboard inlay, made from European maple and myrtlewood for an organic, understated look.