Quote:
Originally Posted by ijh
I've another simple song with a G, D, C, G progression, but then there'll be a D7 inserted after the D sometimes? Hows does this work?
Is it still the same key? And are there some rules to this adding of out of key chords?
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The D7 is actually in the key of G. It is an extended chord, which adds the 7th onto the D chord.
When you build the D chord you have to use the notes from the G major scale:
G A B C D E F#
If you build a 7th chord starting on D (using the "stacking 3rds" method), you will get the following notes:
D F# A C
These notes are the notes in a D7 chord. So D7 is in fact in the key of G. This one's by the book.
If any of this is confusing, be sure to check out the theory lessons in the member's lessons section located
here.
-tkr