What do you get when you cross a guitar with a harp? A 'harp-guitar', obviously. Popular amongst itinerant Italian troubadours in the late-19th Century, Led Zeppelin's Jimmy Page also owns one of these many-stringed classical instruments, although it's not thought he ever used it on any Led Zeppelin recordings.
The pinnacle of gimmicky 80s guitar design, Steve Vai used this triple-neck Ibanez model while a member of David Lee Roth's band: you can see it in action in the 'Just Like Paradise' video.