Hey Friend,
I got the exercise files finished up and the link is below... Sorry for the delay!
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G Major is the V chord in the key of C major. It gives us the third chord shape we can use for any major chord as we see in the CAGED method.
Here's the key and scale again:
I IIm IIIm IV V VIm VII° C Dm Em F G Am B°
The notes for G major are G, B and D. They are the 1 3 5 notes from the G major scale in the key of G major, and they're also the 5, 7 and 9 (2) notes if you're playing the scale in the key of C major. Of course, if you just start counting with the G note in the C major scale, they'll be the 1 3 5 notes, too. Here's the key of G major to illustrate its scale:
G A B C D E F#
As you can see, the key of G major is very close to C major. G major has only one different note - that's the F#, or the seven note. As you'll see in future lessons, the seven note can be added to a chord to make it a seven chord.
G major was the first "challenge" chord for me. That's because of the stretch of the fretting hand while keeping my pinky anchored on the first string at the third fret.
The pinky?! Yup, that's what I said.
Many people play a G chord using their ring finger for the first string note. While that works just fine, that's not how I teach it. Using your index, middle and ring fingers make it somewhat easier to play a G major chord, but I want you to think again about efficiency.
Where are you going to go with the next chord in the progression?
Using the index, middle and ring fingers forces you to make further movements with those fingers to get to other chords. For example, think about switching between a G and C chord. Every finger has to move to another string in a different position. The index has to shift back to the second string. Your ring finger must jump over four strings to the fifth string, third fret. Even your middle has to move over a string.
Conversely, if your pinky is holding down the fort on the first string, your middle and index fingers are already positioned correctly for a C major chord. They just have to lift up and shift one string each, and your index finger is already hovering over the second string - ready to pounce.
As far as keys where the G major chord shows up, let's first look at the major keys:
Key I IIm IIIm IV V VIm VII° C C Dm Em F G Am B° D D Em F#m G A Bm C#°
G G Am Bm C D Em F#°
And the minor keys:
Key Im II° III IVm Vm VI VII Am Am B° C Dm Em F G Bm Bm C#° D Em F#m G A Em Em F#° G Am Bm C D
I ran a little low on time, so the exercise files will be coming either tonight or tomorrow the lesson. For now, review the past few weeks lessons to make sure you're feeling good about the chords we've covered so far.
Have a great day!
Peace~
Dave | 
