Why Does Music Only Use 12 Different Notes?

This is a great video about tuning and notes and….everything.

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Zinn Practice Regimen III (592.7 KiB, 52,849 hits)
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Zinn Practice Regimen (211.9 KiB, 20,272 hits)
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Breckerisms - Michael Brecker Type Patterns (379.6 KiB, 15,065 hits)
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II-V-I Patterns in Bb (4.6 MiB, 12,504 hits)
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II-V-I Patterns Reference (600.9 KiB, 12,104 hits)
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II-V-I Patterns in Eb (4.7 MiB, 11,712 hits)
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II-V-I Patterns in Bb Pages 1 to 100 (1.7 MiB, 11,497 hits)
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II-V-I Patterns in Bb Pages 201 to 289 (1.6 MiB, 10,999 hits)
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II-V-I Patterns in Bb Pages 101 to 200 (1.9 MiB, 10,984 hits)
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II-V-I Patterns in Eb Pages 201 to 289 (1.6 MiB, 10,923 hits)
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