Another mystery of the Elephant 6 is Major Organ and the Adding Machine. It was originally thought to be a side-project of Jeff Mangum and Julian Koster (both of Neutral Milk Hotel). They released a version of Louis Armstrong's What a Wonderful World on Kindercore Records' Christmas in Stereo compilation in 1997.

But the project has grown to include the Elephant Six Orchestra and many others. In March 2001, a CD entitled Major Organ and the Adding Machine was released on Orange Twin Records. The label gives this description of the album:

"The major is a sound poet, instrument builder and complete freak with his teeth out, talking alchemy and eggplants to a dog. the elephant six orchestra is the adding machine, interpreting the majors "compositions" and instructions to create a world of beards vomiting and birthing. please note: this is not neutral milk hotel under another name. this is aunt eggma under the name major organ under the name the elephant six orchestra who all are under the name alfred snouts. alfred snouts is the twin attached to the major, so really this would be a major organ album under the name of no one! "

While the mysterious Major Organ is the apparent leader of this project, some of the contributors were Kevin Barnes (Of Montreal), Jeff Mangum ( Neutral Milk Hotel), Julian Koster (Music Tapes, Neutral Milk Hotel), Eric Harris (Olivia Tremor Control), Will Cullen Hart (The Circulatory System, The Olivia Tremor Control), Andrew Rieger (Elf Power).

Other projects involving Major Organ and the Adding Machine members:
Neutral Milk Hotel, The Music Tapes, The Olivia Tremor Control, The Circulatory System, Elf Power, Of Montreal

ALBUMS	FORMAT	LABEL	RELEASE DATE
Major Organ and the Adding Machine	CD	Orange Twin (OT 002)	March 2001

COMPILATIONS	SONG	FORMAT	LABEL	RELEASE DATE
Christmas in Stereo	What a Wonderful World (Louis Armstrong cover)	CD	Kindercore (KC 018)	Nov. 1997