So, to summarize the new pattern. We will play our basic G Major chord left hand pattern 3 times as usual. However on the fourth time we will switch to a linear single note pattern - G, A, B which takes us back to the C - which is the root note of the C major chord and follows every G major chord in the piece. This is a very important means of providing varation to the left hand part. Instead of blocking out chords the whole time we can add a bit of melody with our left hand to compliment the right hand.