D-sharp, often written as D#, is a musical note that is one semitone higher than D and one semitone lower than E. It is commonly used in various musical scales and compositions, particularly in genres like jazz, rock, and classical music. D-sharp can be represented on a piano keyboard as the black key immediately to the right of D. In music theory, D-sharp is also associated with the D-sharp minor scale, which consists of the notes D#, E#, F#, G#, A#, B, and C#. This scale is often used to create a moody or dramatic sound in compositions. Additionally, D-sharp can be notated as E-flat in certain contexts, as they are enharmonically equivalent.