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← Learn·Compound Intervals

Intervals Beyond the Octave

Builds on Interval Naming & Quality

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A compound interval is simply a simple interval (2nd through 7th) plus one or more extra octaves. A 9th is an octave plus a 2nd; a 10th is an octave plus a 3rd — the ear-recognition skill is identical, since a compound interval keeps the same quality (major/minor) as its simple counterpart, just spread further apart.

Compound intervals matter most once chords stack pitches beyond a single octave, which is common in jazz voicings — a '9th chord' literally adds the pitch a 9th above the root.

💡 Tip

When an interval sounds bigger than an octave, first identify which simple interval it would reduce to if you dropped the top note down an octave — a minor 9th is still fundamentally a minor 2nd's sound, just spread out.

⚠️ Common mistake

Trying to count semitones from scratch across two octaves. It's faster to recognize 'octave plus a 2nd' as two already-familiar chunks than to count all 13-16 semitones directly.

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📝 Summary

Compound intervals = an octave + a simple interval, keeping that simple interval's quality. A 9th behaves like a 2nd, a 10th like a 3rd, spread further apart.

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○ ← Song Anchors for Intervals○ Triads as Stacked Thirds →