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The udderbot is a DIY woodwind instrument co-invented and proposed by Jacob Barton in 2005.[1] It's built out of a bottomless glass bottle and a rubber glove, filled with water. The player's manipulation of the water reservoir allows modulation of the volume (and shape) of the rigid resonating vessel ("bot"). A smooth change of hand position in combination with embochure facilitates a 4-octave continuous glissando range, (5+ octaves including altissimo registers)

Barton's current udderbot. (Why did my iPad make this image upside down?)

Media - live performances (12-EDO and various other tunings)

How to make an udderbot