Joey "Animal Style" Mariano, a Philadelphia chiptune artist, created this awesome Gameboy foot controller to create some amazing 8-bit madrigals:
Using the power of the Gameboy sound chip, Mariano’s madrigals blend the body of early role playing and puzzle video games with awesome, powerful electro-dance beats. Since the Gameboy only has three melodic monophonic channels to create melodies to begin with, this helped Mariano stay true to the traditional madrigal form of 2 to 3 voices.
Geekadelphia has a pretty neat video of Joey (and the foot controllers) in action: Link - thanks Eric!