Formation of altered (extensions) chords EXPLAINED

We have been on a long series for some time now.
You now understand what Triads and sevenths chords are.
Don't be scared of the 9th, 11th, and 13th chords. They are all added to the 7th chord.

Let's try an example.

Writer out the notes for these chords

Fmaj9
Dmin9/6
Cmin13
Abmaj9

Okay let's start with that.

To get Fmaj9 you first need to get Fmaj7[Since 7 comes before 9]

So Fmaj7 has the notes [FACE]
The 9 is the G.
So you add the 9[G] to the Fmaj7 and you'll get
F-A-C-E-G which is Fmaj9 chord

To get Dmin9/6 chord.
First get Dmin9 as D-F-A-C-E then add the 6th note[B] to it.
We'll have D-F-A-C-E-B
Dmin9/6 is pronounce as D minor 9 add6 chord.

To get Cmin13 first get a Cmin7[CEbGBb] then add the 9, 11 and 13 notes to it [since they will all arrive before a 13]

We'll have C-Eb-G-Bb-D-F-A as Cmin13 chord

For Abmaj9 chord first get Abmaj7 [Ab-C-Eb-G] then add the 9th note[Bb] to it and you'll get
Ab-C-Eb-G-Bb as Abmaj9 chord.

I guess those examples made you understand it better.

Now, you try this

F#maj6/9
G7#9 [first get the G7 chord then add the #9 note in key G major]
E7b9
C#min11
A9
Bbmin9

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