D major isn't actually a note. D major is a major scale based on the note D (D natural) and the scale has two sharps (F sharp and C sharp). There isn't anything special about D major since it requires both an F sharp and a C sharp, the most 'special' scale is C major since there are no flats or sharps needed.
The dominant note for D major and D minor is A.
The leading note of Db major is C.
The tonic note of any diatonic scale is the first note (starting note) of the scale. In the case of G-flat major the tonic note is G-flat!
The third note of the diatonic scale of any key.
The supertonic triad in the key of A flat major is B flat, D flat, and F natural
The leading note of Db major is C.
D.
The tonic in D major is D.
The dominant note for D major and D minor is A.
The subdominant note is D in an A major scale
The leading note of Db major is C.
The note "A"
The D note
B
The tonic note of any diatonic scale is the first note (starting note) of the scale. In the case of G-flat major the tonic note is G-flat!
Leading NOTE or the Root note is D#. Leading TONE is D which lies between the sub-mediant and the sub-tonic.
A sus 4