The term Doppler Effect describes the aural phenomenon of something changing pitch relative to what direction it is traveling in relation to the listener. An example is when a siren coming towards you is higher in pitch then when it is going away from you. Sean O'Loughlin uses this fascinating concept to construct an original composition that uses instances of this effect. A broad melody acts as a connective element in the piece, with a multitude of teaching opportunities for dynamics and musicality.