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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 Chord 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 of the scale 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 Chord) and flatten the 7th, you'd have a G Minor Seventh Chord.
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 |