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This is an idea used to great fruition in Ligeti's Music Ricercata for solo piano. There are 11 pieces each ranging from just under a minute to about 4 minutes. Each one from the first one uses a growing amount of notes - the first piece uses only 2 pitches, next one only 3, then 4, etc., until piece 11, which uses all 12.
6 is good - I might try my hand at it.
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