Chord families
Chords can be grouped according to their quality, or type of sound.
The basic groups
Major – 1 3 5 – Happy
Minor 1 b3 5 – Sad
Weird ones
Diminished – 1 b3 b5
Augmented – 1 3 #5
Extended chord families
Major 7 – 1 3 5 7 – Happy
Dominant 7 – 1 3 5 b7 – Unsettled
Minor 7 – 1 b3 5 b7 – Sad