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# Thread: Req: Help me with the fundamental behind Dim , 7th, 9th and Aug chords

1. ## Req: Help me with the fundamental behind Dim , 7th, 9th and Aug chords

Hey guitar lovers,

I'm beginner of sort here but i've been reading and practicing a lot of guitar theory over net.

I 've a clear idear about the fundamental behind sus2 and sus4 chords.
Fundamental : in a triad which is I III V of a root node, if we use II note istead of III then its sus2 chord and if we use IV note instead of III then its sus4. In other words I II V is a sus2 and I IV V is sus4.

Question: Can anyone explain me the fundamental behind any or all of the following type of chords i.e.
1) Dim chords
2) 7th chords
3) 9th chords
4) Augmented chords.

I really want to know that coz then only i'll get better in guitar.
Guitar experts please help.

Thanks.

2. 1)diminished chords- 1 3b 5b
2)7th- 1 3 5 7b
3)augmented- 1 3 5#
4)9th- not sure so wont comment...

3. 1) Diminished Chord is formed by the Root, Flat 3rd, Flat 5th and Flat 7th.

2) 7ths:

In general, a 7th is just an addition of the 7th note to the chord. A major 7th is formed by the addition of the 7th note of the major scale corresponding to the root note of the major chord(usually represented by an M7 or triangle). i.e.- CM7- C E G B

A minor 7th is the addition of the 7th note of the minor scale corresponding to the root note of the minor chord (represented by m7).

Cm7- C Eb G Bb

Dominant 7th: These are also referred to as just 7ths. These chords are formed by adding the b7th note of the major scale corresponding to the root note of the major chord (represented by 7).

C7- C E G Bb

3) 9ths

9ths are just extensions of 7ths. Add the 9th note of the major (or minor though they're the same note) scale of the root note to the chord and it becomes a 9th.

eg-
CM9- C E G B D
It is interesting to note that C E G and G B D make up the C major and G major chord respectively. Thus, playing a G major arpeggion over a C chord should give you a major 9th sound and is quite "pretty".

Similarly-
Cm9- C Eb G Bb D
C9- C E G Bb D

Similarly for 11ths, you add the 11th note to the 9th chord-

CM11- C E G B D F

and so on with 13ths

CM13- C E G B D F A

Since there are so many notes, it's impractical to play all of them at once on the guitar so you tend to skip notes like the 5th, 9th, 11th and sometimes even the root. The 3rd and 7th are the guide tones for the chord (i.e.- telling us whether the chord is major/minor or dom7th) so they should be played.

I'm not sure if this clears anything up. Feel free to ask questions.

4. Thanx bjr and god_of_guitar... bjr you explained it so well...i got everything....

i've one more question, when we write a major scale it is
I II III Iv V VI VII
but when we write a natural minor scale, it is
I II b3 IV V VI VII ( if i'm not wrong)

what does this "b" means here. Does it only mean that we've to flatten the III note of the major scale and we'll get the natural minor scale?

5. Yes.
b = flat.

Thats why you will realise that the difference between minor chord fingereing and major chord fingering is usually just one finger (which is placed one fret back from the corresponding major chord)

Like Amajor:
02220x

Aminor:
01220x

6. Compare a major and a minor scale

A Major- A B C# D E F# G# A

A minor- A B C D E F G A

so its I II bIII IV V bVI bVII

7. ## Thanks Bjr

Originally Posted by KShan
but when we write a natural minor scale, it is
I II b3 IV V VI VII ( if i'm not wrong)
oh ok...what i wrote earlier was melodic minor scale.

Thanks a lot bjr

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