What do you get if you cross an electric guitar with an organ? Why, you get a "guitorgan" of course. Yes, there really is such a thing!
Bob Murrell is credited (blamed?) with its invention and Musiconics Internation (MCI), Waco, TX, claims to have introduced the world to the Guitorgan. However, many others have created them starting with many models of guitar. In any case, all have the basics in common--convert a standard electric guitar to the guitorgan by addition of electric organ components. The organ notes are typically keyed with switches on or under the frets. The guitar remains playable but organ notes can be played instead of or in addition to guitar chords.
Bob worked on converting existing products from the late sixties. In 1968, he had a signficant run of instruments based on semi-hollow body designs. The B300 and B340 are among the most common examples from this run. He continued to produce upgrades that included analog synthesizer interfaces and even midi in the mid 80's.
Vox also produced their own version under the same name, roughly based on their Vox Continential Voice Boards. This is an extremely rare item.
Want to hear it in action? Get Teisco Del Rey's "The Many Moods of" and you'll know exactly what it sounds like.
Bill Dillon is another practitioner of the Guitorgan. He has been future on many Sarah MacLauchlin albums and appeared with the Counting Crows.