Seventh Chords

We've looked at major (root 3rd 5th), power chords (root and 5th) and minor chords (root, 3rd flattened and 5th).
To form a seventh chord, you take a major or minor chord and add another note on top.
However, there are several different kinds of the seventh which you need to be aware of.
Example: This is the scale of G again

1	2	3	4	5	6	7	8
G	A	B	C	D	E	F#	G

The seventh note is an F# and adding this to G major would give a G major seventh chord.
If you flatten the seventh note to F you get an 'ordinary' seventh (called a dominant seventh - G7)
If you flatten the 3rd (to make a minor) and flatten the seventh, you'd have a G minor seventh.
Take a look at the table below:

Chord	1	3	5	7
G major seventh	G	B	D	F#
G dominant seventh	G	B	D	F
G minor seventh	G	Bb	D	F

There are others, but that should cover the 4 strings nicely. There's a full List of sevenths, or you could go on to Sixths