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Diatonic describes notes, scales, chords and melodies that belong naturally to a particular key without using pitches from outside that key.
What does diatonic mean?
A diatonic major or natural minor scale contains seven different notes arranged in a specific pattern of whole steps and half steps. Music is described as diatonic when it primarily uses these notes and the chords built from them.
For example, in the key of C major, the diatonic notes are C, D, E, F, G, A and B. Any note outside this collection, such as C# or B♭, is considered chromatic in that context.
How is diatonic harmony used in piano playing?
Understanding diatonic scales and chords is one of the foundations of piano playing. It allows pianists to recognize chord progressions, harmonize melodies and improvise confidently while staying within the chosen key.
Once you have mastered diatonic harmony, it becomes much easier to understand chromatic notes, secondary dominants, modulation and many other advanced harmonic concepts.