The Martin GPC-18E acoustic-electric guitar gives you the comfort and tone of a Grand Auditorium with the convenience of natural live sound. From the toneful and classic combination of a Sitka spruce top and mahogany back and sides to the smooth ebony fretboard, the GPC-18E offers clear and balanced tone. And the onboard Fishman Aura VT Enhance pickup system gives your plugged-in tone the natural, woody warmth of a truly acoustic sound.