William Dean Martin (aka Billy Martin; born June 15, 1981) is an American author and the guitarist and keyboardist for Good Charlotte.

Martin plays Paul Reed Smith guitars and uses Mesa/Boogie amps. He cooperated with the PRS SE team to produce the PRS SE Billy Martin Model. It was released in 2005 and features green inlays designed by Billy - green dots with a bat which stretches from the 11th to 13th fret.

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