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Writer's pictureClem Buckley

The difference between Maj7 (△7), Dominant 7 and minor 7 chords



After looking at triads/3-note chords, we can now add more notes and colour to our chords.

Looking at major chords, 7 chords (either Major 7 or Dominant 7 chords) are the next step up in chords after triads. We get there by adding a 4th note to the Major triad.

Remember, our Major triads are stacked in 3rds. A Major Triad = 1 3 5 (The 1st, 3rd, and 5th notes from the major scale stacked up on each other).

Keeping the pattern of stacked 3rds, the next logical note to add would be a 7.

So 1 3 5 7 = a Major 7 Chord.

If we lower the 7 a semitone, we get 1 3 5 b7. This is called a Dominant 7 chord.


 

Here are some of the chords we're going to look at and how you will see them written down. I'll use C for all of these examples.


1. C Major7 will be written out either as CMaj7 or C△7

The 1st, 3rd, 5th and 7th note of a major scale

2. C Dominant 7 will be written out as C7

1, 3, 5, b7

3. C minor7 will be written out as Cm7

1, b3, 5, b7

4. C minor Major7 would be written out Cm(Maj7) or Cm△7


 

So, in triads, we can move some of the notes around to get different chords and the first thing to do would be to lower the 7th by a semitone to become a b7. This makes our chord a dominant 7 chord.

Looking at the four examples above, we start out with all the natural notes from the Major Scale and build our triads on the root note of that scale.


  • Major 7 chords is 1 3 5 7

  • Dominant 7 - Lower the 7 a semitone so it spelling is 1 3 5 b7

  • Minor 7, same as the dominant 7 except we make the 3 minor by lowering it a semitone so its spelling is 1 b3 5 b7

  • Minor (Major7) This is a minor triad 1 b3 5 with the natural 7 on top. So it's spelling is 1 b3 5 7


In the video, I also show you 9 chords. These are 5-note chords, so after building up in 3rds from the root (1 3 5 7), the next would be 9 (The 9 is the same note as the 2, just an octave higher). We will look at more chord extensions like 11's and 13's later.


 

C Major7 Guitar Chord
C Major7 Chord

C7 Guitar Chord
C Dominant 7 Chord

C9 Guitar Chord, Music Theory
C Dominant Chord - 1 3 5 b7 9
 

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