Doppler Piece builds from Doppler Effect which simply described is the apparent change of pitch of a constant sound experienced when the sound source or receiver are moving. A common example is the change of pitch experienced when a train passes a stationary observer. As the train “catches up” to the sound it produced seconds before, the lengths between the almost caught up to waves and those successively produced appear shorter, thus an apparent rise in pitch. As the train passes the pitch drops back to its original level.
My intent here is not so much to demonstrate Doppler Effect as it is to move from traditional Western notation toward World music and nature.