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→Open Position G Major Chord
Also included are 1st and 2nd inversion.
==Harmonic Theory: Dominant Chord==
The G is a perfect fifth interval above C. In the key of C Major, the G Major chord is thus called the V chord (that's the roman numeral five, not 'Vee'). It's notes are the perfect 5th, major 7th, and major 9th (2nd) of the key.
The major seventh is called the leading tone because it naturally "wants" to resolve up a half step to the tonic note. The B note in the G Major chord can move up a half-step to C.
The root note of the V chord is also the fifth of the I chord, making its transition from the V to the I chord seamless. The G in the chord becomes the fifth of the C chord (C E G).
The fifth of the V chord is the 9th or 2nd of the I chord. For G, this is the D note. It can descend one whole-step to the root note of the I chord (C) for a very peaceful resolution or ascend one whole-step to the major 3rd of the I chord (E) for a richer harmony.
This makes the V chord ideal to lead into the I chord. This is called an [http://en.wikipedia.org/wiki/Cadence_(music)#Authentic_cadence authentic cadence].
The V chord is also called the Dominant chord.