D major is a major key based on the D (re) sound, and is called D major in English. It is composed of D, E, #F, G, A, B, and #C. The key signature has two sharps. The relative minor is B minor and the parallel minor is D minor.

First of all, we need to explain the two systems of "roll call" and "note name". In music, solfa, as the name suggests, refers to the name of the note used when singing the score, that is, 1234567 (do re mi fa sol la si). The note name is the name of each note in the music, named with letters, respectively CDEFGAB.

Extended information:

Other major keys: A major

A major is a major key based on the A note, consisting of A, B, C? , D, E, F?, G? and A. The key signature has three sharps. The parallel minor is F sharp minor and the tonic minor is A minor. All closely related keys are F sharp minor, D major, B minor, E major, C sharp minor is the relative minor, F sharp minor, and the parallel minor is A minor.

Baidu Encyclopedia-A major

Baidu Encyclopedia-D major