You already know a chord is a combination of at least three sounds, played either simultaneously or in a short succession. Here you have the explanation of both seventh and ninth chords. You will see they are very easy.
Seventh chords basically include four sounds: Besides the basic three the chord is composed of, it includes the one which is one tone (two half tones) less than the main one. That is, a seventh C chord includes the A# note (Bb), which is the note which is one tone less than its mother. Thus, we have:
Major seventh chords
C – E – G – Bb
D – F# – A – C
E – G# – B – D
F – A – C – Eb
G – B – D – F
A – C# – E – G
B – D# – F# – A
Minor seventh chords
A – C – E – G
B – D – F# – D
C – D# – G – Bb
D – F – A – C
E – G – B – D
F – G# – C# – Eb
G – A# – D# – F
Nine chords also include a fourth sound; but, opposed to seventh ones, the fourth sound is the one which is one tone (two half tones) more than the main one. Thus, we have:
Major ninth chords
C – E – G – D
D – F# – A – E
E – G# – B – F#
F – A – C – G
G – B – D – A
A – C# – E – B
B – D# – F# – C#
Minor ninth chords
A – C – E – B
B – D – F# – C#
C – D# – G – D
D – F – A – E
E – G – B – F#
F – G# – C# – G
G – A# – D# – A
Heptagrama, the web summed up.
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