Double neck guitars are old hat, so make way for the Pikasso, a 42-sting guitar that was borne out of a challenge to make a guitar with “as many strings as possible.” The guitar has four necks and two sound holes, plus enough pizzaz to wow even the most “woe-is-me” emo kid on the block. Interestingly, the guitar makes use of a design element called “the wedge,” which tapers the size of the guitar so that it's thinnest where it presses up against the guitarist's body. This gives the guitarist...