A minor seventh chord is a minor triad with an added seventh interval:
◊ Minor 7th
A Dmin7 has an added minor seventh: D – F – A – C
◊ Minor/Major 7th
A Dm/M7 has an added major seventh: D – F – A – C♯
◊ Minor 7th Flat Five*
A Dm7♭5 is a Dmin7 with a diminished fifth: D – F – A♭ – C
* also called a half-diminished seventh chord
♫ More Piano Chords:
Dmaj ▪ Dma7 ▪ Dma9 | Dmin ▪ Dm7 ▪ Dm9 | Ddim ▪ D°7 | Daug ▪ D+7 | Dsus2 ▪ Dsus4
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