The digits of tau determine which chord is played. The melody is improvised and has no relation to tau... at least, not that I'm aware of!
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For those who may not know, tau is simply 2 times pi.

Chord mapping:
0 = B diminished
1 = C major
2 = D minor
3 = E minor
4 = F major
5 = G major
6 = A minor
7 = B diminished
8 = C major
9 = D minor

Digits used: 6.283185307179586476925286766559005768394338798

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