The D#7 chord (dominant 7th): notes D# G A# C#, degrees 1 – 3 – 5 – ♭7. Guitar shapes: xx1323, x68686, 11-10-8-8-8-9, 11-13-11-12-11-11.
A chord is the root plus degrees above it, most often stacked in thirds. Major and minor differ only in the lower third: a major third (M3) sounds bright, a minor third (m3) sounds sad. Pick a chord and a root to see its degrees and intervals, and its shapes.
m — minor, M — major, P — perfect, A — augmented interval; the number is the degree count. m3 is 3 semitones, M3 is 4, P5 is 7
D# D#m D#5 D#7 D#m7 D#maj7 D#sus2 D#sus4 D#add9 D#6 D#m6 D#9 D#dim D#dim7 D#m7♭5 D#aug