What strikes me as odd, is that people like Billy Sheehan and Tim Commerford own and play custom made double neck basses from which both halves are identical to each other. It's an entirely different story with the double neck of Rinus Gerritsen from The Golden Earring. Rinus plays a custom built double neck in the shape of a Danelectro longhorn (A bass which he was a well known fan of) But the halves are COMPLETELY different from each other. The upper half of the bass has a Fender P-bass neck, Bill Lawrence pickups and that portion of the body is made from solid alder. The lower half of the bass is hollow with a masonite plate fitted flush to the top of the body, the Dano neck is a 30 inch short scale and it has 24 frets, the lowerhalf also has a kahler whammy. When in concert Rinus Plays almost the entire set on this double neck, interchanging necks when a different sound is needed, it has the "Boom" of a P-bass and the twang of a Dano.