***There are 12 major scales (DO, #DO, RE, #RE, MI, FA, #FA, SOL,

#SOL, LA, #LA, SI)

Among them, the key of D is divided into major and minor.

D major is a major key based on the D sound, consisting of D, E, F?, G, A, B, C?, and D. The key signature has two sharps. The relative minor is B minor and the parallel minor is D minor.

d.

Modern minor scale:

In addition to the key signature, in modern harmony, technology continues to advance, and the tonality of major and minor keys also changes. It is no longer very important. Composers need a new scale. The modern minor scale appears. Unlike the melodic minor scale, the modern minor scale does not use the sixth level when descending. The sound and seventh level sound are restored.

G major means that songs with Sol as the initial note are songs in G major

G major is a natural major key in which the main note is G. Two concepts are included here, namely "tonality" and "mode". These are basic concepts in music theory