Minor 7th (m7)

Root Position

Prove it — just do the practice exercise.
Dm7 Root Position
D (R)F (♭3)A (5)C (♭7)
The m7 is the soft, melancholic chord.

Root
Minor 3rd — 3 semitones
5th — 7 semitones
Minor 7th — 10 semitones

Example: Dm7 = D + F + A + C

Minor 3rd + minor 7th = minor character.