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Functional harmony is the study of how chords relate to one another within a key. Instead of focusing only on chord names, it explains the musical function each chord performs.
What is functional harmony?
Functional harmony classifies chords according to their role in a key. The three primary harmonic functions are tonic, subdominant and dominant. Together, these functions create the balance between stability, movement and resolution that defines tonal music.
Understanding functional harmony makes it easier to recognize common chord progressions and see the relationships between different keys.
How is functional harmony used in piano playing?
Piano players use functional harmony to analyze chord progressions, transpose songs and improvise more confidently. Recognizing harmonic functions allows the same musical ideas to be applied in any key rather than memorizing individual chord names.
Functional harmony is one of the foundations of arranging, accompaniment and harmonic improvisation.