An acoustic “roaring wind” sound occurs in the beginning of the song, yields to the other acoustic sounds, and then eventually to pure electronic sound. The flute improvisation is first slow-moving, accelerates, and then is transformed into cascades created with a computer list-sorting algorithm. The same algorithm generates a series of cascading granular pitches that complement those of the flute and bird. In the end the song returns to a pure acoustic birdsong response.