7th Chords

• An extension of triads by adding another 3rd onto the stack.
• With the additional note there are many more tonalities of 7th chords than there are with triads.
• All contain some kind of Root, 3rd, 5th, and 7th.

Some of the more common 7th chords
(below using C roots for examples)

Tonality	Chord symbol	Chord Tones	Notes
Major 7th	C7	R 3 5 7	C E G B
Minor 7th	C-7	R 3 5 7	C E G B
Dominant 7th	C7	R 3 5 7	C E G B
Minor-Major 7th	C7	R 3 5 7	C E G B
Half-Diminished 7th	C7 aka C-7(5)	R 3 5 7	C E G B
Altered Dominant	C7+ aka C7(alt)	R 3 5 7	C E G B
Diminished 7th	C7	R 3 5 7	C E G A

• 7 is the enharmonic equivalent of M6.
• There are a slew of altered dominant chords, above is just one example.