Why Does Music Only Use 12 Different Notes?

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

Videos

Zinn Practice Regimen III (592.7 KiB, 52,851 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, 15,067 hits)
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II-V-I Patterns in Bb (4.6 MiB, 12,508 hits)
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II-V-I Patterns Reference (600.9 KiB, 12,107 hits)
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II-V-I Patterns in Eb (4.7 MiB, 11,715 hits)
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II-V-I Patterns in Bb Pages 1 to 100 (1.7 MiB, 11,499 hits)
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II-V-I Patterns in Bb Pages 201 to 289 (1.6 MiB, 11,001 hits)
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II-V-I Patterns in Bb Pages 101 to 200 (1.9 MiB, 10,985 hits)
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II-V-I Patterns in Eb Pages 201 to 289 (1.6 MiB, 10,924 hits)
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Zinn Practice Regimen III (592.7 KiB, 52,851 hits)
You do not have permission to download this file. Go register first.
Zinn Practice Regimen (211.9 KiB, 20,272 hits)
You do not have permission to download this file. Go register first.
Breckerisms - Michael Brecker Type Patterns (379.6 KiB, 15,067 hits)
You do not have permission to download this file. Go register first.
II-V-I Patterns in Bb (4.6 MiB, 12,508 hits)
You do not have permission to download this file. Go register first.
II-V-I Patterns Reference (600.9 KiB, 12,107 hits)
You do not have permission to download this file. Go register first.
II-V-I Patterns in Eb (4.7 MiB, 11,715 hits)
You do not have permission to download this file. Go register first.
II-V-I Patterns in Bb Pages 1 to 100 (1.7 MiB, 11,499 hits)
You do not have permission to download this file. Go register first.
II-V-I Patterns in Bb Pages 201 to 289 (1.6 MiB, 11,001 hits)
You do not have permission to download this file. Go register first.
II-V-I Patterns in Bb Pages 101 to 200 (1.9 MiB, 10,985 hits)
You do not have permission to download this file. Go register first.
II-V-I Patterns in Eb Pages 201 to 289 (1.6 MiB, 10,924 hits)
You do not have permission to download this file. Go register first.