One of the mysteries of the English language finally explained.
An interval greater than an octave.
- ‘The number of a compound interval is always 7 more than its related simple interval with the same letter name.’
- ‘See how the common intervals are in the bass clef and the compound intervals are in the treble clef.’
- ‘The only compound intervals appear where, for example, a second is considered dissonant whereas its compound form as a ninth, or its inversion as a seventh, is considered consonant.’
- ‘Perfect fifth added to perfect fifth makes major ninth which is a compound interval of major second.’
- ‘The names of the compound intervals are those of the simple intervals plus the number seven.’
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