Evolution I for percussion ensemble is built on a single 25 note rhythmic pattern where the last note of the pattern becomes the first note on the pattern when it is repeated.
The original pattern was two bars long, this is performed by the conga when it enters. The other instruments (with the exception of the snare drum) all play the same 25 note pattern either in an augmented (mostly) or diminished note durations so as the pattern can last as long as 16 bars or as short as a bar.
The piece gradually builds as more instruments enter the fry and the volume increases. The piece ends when all of the instruments reach the end of their pattern at the same time at the down beat of letter "G".
While specific instruments are indicated in the score, performers should feel free to substitute instruments with what they have available; keeping in the relative "pitches" and the decay characteristics of the instruments in mind.
Ursus Demens
Note: The score's indicated duration of 4'33" was not planned nor intended, it just randomly happened.
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