Watch the G Form: Trill Exercise online guitar lesson by Dave Celentano from CAGED Commander

In this trill exercise, the only notes that reside outside the 'G form' frame are the 10th fret notes on the low E, B, and high E strings. Maintain even note spacing for these triplets and make smooth transitions when jumping from string to string. Notice the index finger is playing only chord tones (root, 3rd, and 5th) and the hammer-on notes are non chord tones (2nd, 4th, and 6th).