refers to the distance between two pitches, and the distance between D-sharp and E-sharp is a whole tone. In music, D and E are usually used to express a bright and cheerful emotion, which is common in pop music, rock music, electronic music and other music types. Pitch and interval in music are important concepts in music theory, which are of great significance for understanding and composing music. Pitch refers to the level of notes, and interval refers to the distance between two notes. In western music, commonly used intervals include semitone, whole tone, major third, minor third and so on. By studying music theory, we can better understand and appreciate music, and we can also create and play music better.