Progress is not only due to aesthetic considerations. There is also technological breakthroughs to take into account.
For example, until the piano was invented, nobody was writing piano concertos.
Who knows what the next few years will bring in terms of technology? What kind of music, for example, would a device harnessing brainwaves and converting them into sound, make?
There are 12 notes in the Western scale. 2 notes have 12 possible intervals. 3 notes have 144 possible combinations of interals. 4 notes have 1728 combinations. 5 notes have 20736. 6 notes - 248832. 7 notes - 2,985,984 8 notes - Almost 36 million different combinations. That vast majority of which would be pretty shite, but there you go.
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