D minor is a musical key that is often associated with a somber or melancholic mood. It consists of the notes D, F, and A, forming a minor triad. This key is frequently used in various genres, including classical, jazz, and popular music, to evoke deep emotions. In Western music, the D minor scale includes the notes D, E, F, G, A, B♭, and C. Composers like Ludwig van Beethoven and Frédéric Chopin have written notable works in this key, showcasing its expressive qualities. The key signature of D minor has one flat, which is the B♭ note.