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Perfect Fifth – Definition
A perfect fifth is an interval spanning five letter names and seven semitones. It is one of the most stable and fundamental intervals in Western music.
What is a Perfect Fifth?
The perfect fifth belongs to the family of perfect intervals, together with the unison, perfect fourth, and octave. It plays a central role in scales, chords, harmony, and tonal music.
The perfect fifth forms the outer structure of major and minor triads and is widely used in chord progressions, accompaniment, and melodic writing. Its strong sense of stability makes it one of the most recognizable intervals in music.
How is a Perfect Fifth used in piano playing?
Pianists frequently use perfect fifths in left-hand accompaniment patterns, chord voicings, and bass lines. Playing the root and fifth together creates a strong harmonic foundation that works well in many musical styles.
The perfect fifth is also the basis of power chords, open voicings, and common accompaniment patterns, making it an essential interval for both beginners and advanced pianists.