We’ve already looked at the basic major and minor chords, but there are far more possibilities than just these two chords.
There are two types of seventh chords; major 7th and minor 7th. These build up from the original chord to make it a four note chord. For example:
C7: C E G B
Cmin7: C E G B♭
Ninth chords are extensions of seventh chords. This means that they include the root, third, fifth, seventh and ninth. For example:
C9: C E G B D
C min 9: C E G B D♭
Unlike the 7th or 9th chords mentioned above, augmented chords are different to major and minor chords. They are built of three major thirds.
C aug: C E G♯
Diminished chords are similar to augmented chords, but instead of major thirds, they are made up of minor thirds.
C dim: C E♭ G♭
An added chord is like a major or minor, but with an extra note.
Cadd2: C D E G
Cadd4: C E F G
Unlike an added chord, the third is removed and replaced by an alternative. So the third, in this case the E, is missing from the below chords.
Csus2: C D G
Csus4: C F G