G7 Chord

Its the g major seventh chord, is also know as the G7 chord (G Seventh). G7 is know for being used, mostly, as a transition chord from the G chord. This is its most common use, although it's not limited that.

To give you an idea on how it can be used as a transition chord, let's use the following example: G, G, G7, C. G7 comes instead of another G this adds more variety in the progression on the piece.

This is in theory a simple chord to play, although its main difficulty lies on the position of the hand.

You should try to have your hand and wrist away from the neck, not hugging and the distal joints (last joints of the finger) must be very flexed. This depends heavily on the type of guitar you are playing, specially the neck. For example, on a classical guitar the distal joint must be very bent, making it a bit harder for some people with smaller hands.

The G7 is played with your first finger fretting the first string against the first fret instead of the forth finder at the third fret. Changing back and forth between g and g7 by exchanging your first and fourth finger positions.

Another way, some guitar players use to play this chord is by utilizing their first three fingers. In fact, many instructors argue that the second finger is really not at all necessary in order to play the g7 chord. Noting that normally, 'harmonically speaking', it really makes no difference one way or the other. Also, it must be noted that the same finger ability would be required for other functions. Is recommended that players get real familiar with the G chord first before trying to play the G7 Chord, normally making it far more simpler and easier.