Porter muses over the highlights of his vast collection used on records by everyone from B.B. King to Eric Clapton to the Smiths.

"The K in this Martin's model name is for the Hawaiian koa wood. Koa guitars like this one were mostly for playing Hawaiian slack key," says Porter. Koa wood got very popular with Hawaiians, and then the world, which has made koa wood almost endangered. This guitar is in really perfect shape. Porter describes the sound of koa as," a little crisper than rosewood, similar in a way to maple."