How to play Dm7 (D m7) on Bass

Dm7 is the D m7 chord. It is built from 4 notes — D, F, A and C — which sit at the root, minor third, perfect fifth and minor seventh above the root D. Written as a formula that is 1P – 3m – 5P – 7m. Those intervals, not the note names, are what give the chord its character: move all of them to a different root and you still hear a m7 chord.

Dm7 on bass is a movable shape with no open strings, fretted between fret 10 and fret 12, the shape spans 3 frets, 2 strings are muted and should not sound — damp them with the underside of a fretting finger. Since the shape uses no open strings it is fully movable: slide it one fret higher and you have the same chord a semitone up, which is the cheapest way to learn eleven more chords from one hand position.

The interval that defines this chord is the minor third between D and F. Lowering the third by one semitone is the entire difference between D major and D minor, and it is the reason the chord reads as darker or sadder to most listeners. The added minor seventh stops the chord from sounding like a resting place — it leans forward and wants to resolve, which is exactly why it turns up at the end of a phrase rather than the start.

Dm7 belongs to 3 major keys, including C major, where it is the ii chord, F major, where it is the vi chord and Bb major, where it is the iii chord. That is the practical reason to learn it: a chord that is diatonic to several keys turns up constantly, and knowing which degree it occupies tells you what tends to come next. A ii chord in C major most often moves toward the tonic, so practising Dm7 in the context of C will teach you more than practising it in isolation.