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Originally Posted by ijh
Ah ok so i can extend the basic Maj or Min chords from the key to produce extensions.
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Yep.
As long as those extensions fit the key (as explained below...)
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Does this include sus chords then? Could i include a Dsus2 or Dsus4 in that case then?
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If you are trying to follow the key (using only chords that contain notes found in the key), then you want to make sure that whatever note(s) you are adding or changing are in the key as well.
Using your two examples:
Dsus2 = D E A
D, E, and A are in the key of G.
Dsus4 = D G A
D, G, and A are also in the key of G.
So, both Dsus2 and Dsus4 can be used in the key of G.
If you ever have any question as to whether a certain chord or extension will work in a key:
1) Write out all the notes in the scale for whatever key you're in (in this case the G major scale is used because we are in the key of G major).
2) Write out all the notes of the chord in question (as I did above fore Dsus2 and Dsus4).
3) Compare the notes in the chord with the notes in the scale. If all the notes match, then the chord falls within the key. If you have any notes that do not match the scale, the chord is not in the key.
Here's an example of a chord that
DOESN'T fit in the key of G major.
Csus4 = C F G
Comparing this to the G major scale, we can see that C and G both match the scale, but Csus4 has an F note while the G major scale has an F# note (not F). Therefore this chord does not fit within the key.
This process can be applied for any chord you are interested in and it will tell you whether or not it fits within the key.
Hope that helps.
-tkr