It whispers, it sings, it rocks, and it howls. It expresses the voice of the folk--the open road, freedom, protest and rebellion, youth and love. It is the acoustic guitar. And over the last five decades it has become a quintessential American icon. Because this musical instrument is significant to so many--in ways that are emotional, cultural, and economic--guitar making has experienced a renaissance in North America, both as a popular hobby and,...