Two science majors taking a keyboard (piano) class. The two decide to create a piece that attempts to combine randomness and coherence. Rules: 1. There is a set motif for each segment. The motif is prewritten. It's decided who must play it at each time. The other may play it, but may also rest or make something up. Made up melodies must use whole tones, half tones, or tritones but not more than 1 of the 3 in one segment. The conclusion and intro are prewritten for both players. 2. You may play the assigned motif in any key you desire. The other player is not told which keys. 3. Tempo, time signature (usually 5/8 or 7/8), structure, and dynamics are pre-determined.