Seventh Chords & Color
Stack one more third on a triad and you get a seventh chord: hear the dreamy maj7, the smooth m7, and the bluesy pull of the dominant 7 — the sound of jazz and R&B.
A triad is a three-story building; add one more floor and the sound instantly turns sophisticated. Cycle through maj, maj7, m7, and 7 below and listen to what the fourth story does.
The fourth story: the seventh
On top of a triad, skip one and take one more — stack one more third. The new note lands a seventh above the root, which is why these are called seventh chords. That single extra note leaves the foundation untouched but throws a whole new light over the building.
Three everyday colors
maj7 (major seventh): bright yet hazy, like a soft-focus filter on a major triad — dreamy and urbane, the signature of neo-soul and city pop. m7 (minor seventh): it rounds off the minor triad's sadness into something smooth and laid-back — it is everywhere in lofi and R&B. 7 (dominant seventh): a major triad plus a minor seventh, with a built-in twist of tension — unmistakably bluesy, always leaning toward the next chord. It is the engine of blues and jazz.
Jazz and R&B live here
Folk and pop often run on clean triads, but in jazz, R&B, and neo-soul nearly every chord carries a seventh or taller extensions. Next time a chord progression sounds expensive, guess sevenths first — you will usually be right.
Quiz
What does a seventh chord have that a triad does not?