What is a Perfect Twelfth?

A perfect twelfth is a musical interval that spans nineteen semitones. It can be thought of as the distance of a perfect fifth extended by an octave. For example, the interval between C and G an octave higher is considered a perfect twelfth.

Because it is built from a perfect fifth plus an octave, the perfect twelfth has a strong, stable sound similar to a perfect fifth but with a wider range. This interval often appears naturally in music when chords are spread across different octaves, especially in arrangements for instruments that play both bass and higher notes.

Perfect twelfths are commonly used in orchestration, piano playing, and guitar arrangements where notes are spaced far apart to create a fuller sound. They can also appear in harmonic structures and chord voicings to add depth and power to the music. Like other perfect intervals, the perfect twelfth is considered consonant and blends well within many musical styles.