24:09
· Mammoth Beat Organ · named · high confidence
“Sam Underwood and Graham Dunning... built this thing called the Mammoth Beat Organ, a giant modular acoustic instrument, driven by an electric motor.”
Herbert commissioned a bone tombola for this custom mechanical modular acoustic instrument to create the rhythm on 'The Horse Is Prepared', and later mounted the bone flutes on its air-pumped organ-pipe section.