The next Harmonix game involve this two-player pump organ.
Tauba Auerbach and Cameron Mesirow (aka Glasser) created this beast of a pump organ with the intent that no one should play music alone. We think it should feature prominent in a future Rock Band:
The instrument cannot be played alone. Each player has a keyboard with alternating notes of a four octave scale. Each player must pump to supply the wind to the other player’s notes.