A unique work for concert band: performed "forward," the music represents Einstein's theory of general relativity; performed "backward," it elicits the subatomic dynamism of quantum mechanics. Finally, when the piece is performed both forward and backward simultaneously, the juxtaposition of the music evokes a quantum superposition, which enables minuscule particles (photons, neutrons, and quarks as metaphors for pitches, rhythms, and phrases) to exist in many different states, or different versions of themselves, all at once.