"Come Out" was composed by Steve Reiche in 1966. It is a single spoken line ("Come Out to Show Them") that is introduced and then expanded upon gradually. The line was recorded on two channels, which are initially played in unison. Quickly into the piece they fall out of synchronization as channel two is played slightly before channel one. Gradually the discrepancy becomes a reverberation, and then two voices split into four, looped continuously. The effect is to intimately reveal the rhythmic and tonal patterns of spoken word, as the one line becomes a self-contained ensemble. Four voices split into eight and so on until the line is almost unintelligible for all of the times it is repeated on top of itself. The conclusion of the 11 minute piece is a polyphony of sound and rhythmic elements. The piece is a great example of Systems Music, which involves the continual progress from the initial theme to an entirely new result.