The essential guide to identifying, acquiring, and appreciating specimen guitars, where rarity, craftsmanship, and sound converge. P icture, if you will, popular music without the guitar. It looks wrong, doesn’t it? Elvis would have cut a very different figure if he hadn’t had a Martin Dreadnought strapped round his neck to distract somewhat from those offensively gyrating hips. It’s hard to picture John Lennon on The Ed Sullivan Show without his Rickenbacker 325.