Watch the I IV V Layouts online guitar lesson by Brad Carlton from Blues Bass
This lesson addresses the issue of locating the I, IV and V in two different layouts on the fingerboard. In the first diagram included with this lesson, you will see that if the I is on the fourth string, the IV will always be in the same fret on the third string and the V will always be two frets higher than the IV. The other layout for these three tones is shown in the second diagram. If the I is on the third string, the IV will always be two frets lower on the fourth string and as before, the V is always two frets higher than the IV. Knowing these two layouts enables you to play in any key and still stay in the lower regions of the fingerboard.