Resource 9 of 14Book 1
QR-B1-009
Omission Principle Explained
Core Teaching6–8 min
Objective
Distinguish omitted-key counting from semitone distance.
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Focus
“O3 does not mean three semitones. It means three keys are left out between the two notes you press.”
Decode
- 01The physical action: Press – Omit – Press – Omit – Press.
- 02The codes O0 through O4 and what each one leaves out.
- 03Why O3 means three omitted keys but four semitones of distance.
Omission Formula
Semitone distance = omitted keys + 1
- O3 → 3 omitted keys → 4 semitones.
- Count what you leave out, not what you travel.
Practise Now
- 01Play O1, O2, O3 and O4 from two different root notes.
- 02State the semitone distance out loud for each one before playing.
What you should be able to do
You can apply O-codes accurately and convert between omitted keys and semitone distance.
Return to the Book
Student Handbook — Chapter 9
Close the resource, return to this page in the book and practise the pattern.