The Auerglass is a two-person, mechanical-action organ. The instrument requires two people to create music and cannot be played alone. This marriage of interdependency and cooperation is achieved as one player pumps the bellows while the other creates music and vice versa.
The two keyboards cover a four-octave range and have been divided so that each of the two players has every other note at their disposal. Auerbach and Mesirow (of the band Glasser), will play a composition written specifically for the instrument. It combines music that Auerbach wrote as a child, songs from Glasser, and new material.
Here is an video interview of the two women who thought it up.