D7 Chord on Piano
Look at the image to see how to play D7 in the root position on piano.
You should basically play the notes D (above middle C) F#, A and C with the 1st, 2nd 3rd and 5th fingers.
The meaning of a chord in the root position is that the key note of the chord (D in our case) is placed as the lowest note of the chord.
The D7 chord functions mostly as a Dominant Chord. That means that this chord contains a lot of tension that needs to be solved to the Tonic which functions as the Release chord.
The D7 chord is made out of a major third which defines it as a major chord, then two minor third on top of each other.
Another way to build this chord quickly is by building a D Major chord and adding a minor third on top of the A note, or adding a whole tone under the key note (D) which will create a D7 chord in the 3rd inversion (All possible chord inversions are given below in this page).
Now let's invert D7 into all possible chord inversions(So the key note of the chord will appear in different places of the chord). The possible chord inversions are given in the image.
So when we'll see the chord symble D7 above a bar it means we have to play a D7 chord.
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