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Mandolin Lessons: The 7th or Dominant Chords

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[MUSIC]
Okay by now,
you may have been in a jam session
somewhere, and somebody said, oh,
play a G7 there or play a D7 and
you're starting to get confused about all
these numbers.
[COUGH] So let's try and clear up some of
that mystery for you.
So, we're gonna talk about seven chords
seven chords.
Everybody knows a G chord right, we've
shown you that.
The simplest way to, tell you is you
simply, play the F note with your
first finger on the first fret and voila
you've got yourself a G7, that's it.
Here's a little bit of the why of it.
If you take a G scale, one,
two, three, four, five, six, seven, eight.
The seventh note is the scale.
You flat it, and add it to that chord and
that creates the seventh chord.
So, here's G.
[MUSIC]
Here's G7.
[MUSIC]
Practice going between those two.
[MUSIC]
Now go back to the C chord, and
again the beauty of the mandolin, same
thing, same shape.
First fret of the second string B flat,
instead of the C note.
Now let's look at D chord.
[MUSIC]
How do we make this into a seventh chord.
We add a C note to it.
[MUSIC]
C being the seventh note of a D scale.
To review.
1, 2, 3, 4, 5, 6, 7, 8.
The seventh note, you flatten it from a
C-sharp to a C-natural.
Then you add it to that chord, and that's
a D-seven.
You say, well where do we use these
chords?
Well the seventh, a seventh chord is used
in, in the place of the five-chord.
You've got three principle chords and then
a key.
In the case of the key of G.
G, A, B, C and D.
D being the five.
D will become a D7 chord now.
And you'll hear it.
[MUSIC]
G chord is the one.
[MUSIC]
C chord is the four.
[MUSIC]
There's your D7, to get us back to one.
That little seventh note has a, has
tension in it because it wants to
pull very badly to that B note, as part of
that G chord.
[MUSIC]
All right,
so now we're gonna use these in a couple
of tunes.
[MUSIC]