Piano C7 Chord
C7 is a dominant 7th chord. If you tak a C Major Chord and add a Bb above the G (creating a minor third between G and Bb) you basically add a tension to the chord that makes it so DOMINANT that it has to go to F major chord.
You can learn more about Dominant Chords in Here.Click here to read about building 7th chords It is much easier to understand the concept behind understanding all the 7th chord together instead of just one at a time.
In order to play a C7 chord you should basically play the notes middle C E, G and Bb with the 1st, 2nd 3rd and 5th fingers. (Have a look at the image)
The C note (The key note of the chords) is played as the lower note of the chord in the root position. Here below I'll show you how to play this chord in the other chord inversions.
If you're not sure whether you got it right check out the musical intervals you created. The C7 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 E Major chord and adding a minor third on top of the B note, or adding a whole tone under the key note (E) which will create a C7 chord in the 3rd inversion (All possible chord inversions are given below in this page).
Now let's invert C7 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.
The chord symble of a C7 chord is simply stated like this: C7.