Another important chord type is the Dominant 7th chord, commonly called a 7th chord. 7th chords are common in Blues, Rock, Funk, Jazz and many other styles of music. 7th chords can be derived from the major scale by adding the flattened 7th degree (note) of the scale to a major chord.
Here is a common fingering for a C7 chord. Practice changing between F, Bb and C7 as shown in the following example.
C7
Like major chords, most moveable 7th chord shapes also follow the five basic open chord forms, i.e. C7, A7, G7, E7 and D7. Here are the most common shapes for these chords.
C7
A7
G7
E7
E7
D7
Notice that there are two shapes here for the E7 chord. It is also possible to find alternative fingerings for the other chords. Once you know which notes make up a particular chord, it is possible to arrange these notes in any order as long as the fingering is practical. The following example should help you become familiar with these basic 7th chord shapes.