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D-flat (Db) is the note D lowered by one semitone using a flat (♭). On the piano, it is the black key immediately to the left of D.
What is D-flat?
D-flat is an example of enharmonic equivalence. In the equal temperament tuning system, it sounds exactly the same as C-sharp (C#), even though the two note names are used in different musical contexts.
D-flat appears naturally in keys such as D-flat major, B-flat minor and G-flat major. Whether a note is written as D-flat or C-sharp depends on the key signature and its harmonic function.
How is D-flat used in piano playing?
D-flat is one of the most common black keys on the piano and appears in many scales, chords and chord progressions. Learning to recognize D-flat quickly helps pianists navigate flat keys with greater confidence.
Understanding the relationship between D-flat and C-sharp also strengthens your knowledge of key signatures, harmony and musical notation.