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, 52,837 hits)
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Zinn Practice Regimen (211.9 KiB, 20,264 hits)
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Breckerisms - Michael Brecker Type Patterns (379.6 KiB, 15,059 hits)
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II-V-I Patterns in Bb (4.6 MiB, 12,492 hits)
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II-V-I Patterns Reference (600.9 KiB, 12,102 hits)
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II-V-I Patterns in Eb (4.7 MiB, 11,707 hits)
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II-V-I Patterns in Bb Pages 1 to 100 (1.7 MiB, 11,489 hits)
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II-V-I Patterns in Bb Pages 201 to 289 (1.6 MiB, 10,996 hits)
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II-V-I Patterns in Bb Pages 101 to 200 (1.9 MiB, 10,982 hits)
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II-V-I Patterns in Eb Pages 201 to 289 (1.6 MiB, 10,921 hits)
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