So for example, in the key of G# major.
D# is the V chord
In major key the V chord should be a major, so does that mean if I am doing a seventh chord, it should be D#maj ? This would be: D#, G, A#, D. But ‘D’ is not a note in the key of G# major.
So does the whole concept of Chord I, IV, V being major chords in a major key only extend to triad chords? does the seventh note not ascribe to the rules of being a major or minor (according to 1 4 5/ 7 /2 3 6), and rather the seventh note is whichever note fits into the key (so in this case it would be D#, G, A#, C#, a D#7 chord)?