An acoustic guitar radiates sound primarily from the top plate, the back plate, and through the sound hole, leading to a rather interesting sound field [E. T. Watson and T. D. Rossing, J. Acoust. Soc. Am. Suppl. 1 83, S119 (1988)]. The modes of vibration of the guitar body, including the top plate, the back plate, and the enclosed air, and the radiation patterns that result from exciting these modes in an anechoic room, are described.