musique/examples/rhythm-of-primes.mq

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Inspired by Marc Evanstein video "The Rythm of The Primes"
Link: https://www.youtube.com/watch?v=8x374slJGuo
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This program will iterate over natural numbers, playing chords
based on which prime divides given number. This results in
following execution:
step: 2 3 4 5 6 7 8 9 10
1 1 1 1 1
2 2 2
3 3
where each index corresponds to specific note from scale.
Assuming scale [c,d,e] example above would be
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step: 2 3 4 5 6 7 8 9 10
c c c c c
d d d
e e
which would resolve into:
play c d c e (c & d) c d (c & e)
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Length := 40,
cmajor := (c,d,e,f,g),
scale := reverse cmajor,
primes := nprimes (len scale),
indicies := up (len scale),
oct 3,
len (1/16),
for (2 + up Length) ( i |
play (chord scale[indicies[i % primes == 0]]),
),