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Unit 5 · Intervals · Lesson 5 of 5

Inverting

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The rule of nine

To an , move the lower up an . C–E (a 3rd) becomes E–C (a 6th).

  • The numbers always add to 9: 3 ↔ 6, 2 ↔ 7, 4 ↔ 5.
  • ↔ , ↔ , perfect stays perfect.
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