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The CAGED system is a very large yet simple step in the right direction for the guitarist of any level. It teaches things as basic as understanding the fretboard, all the way to understanding and playing different modes. If you want to learn to solo like your favorite guitarist, it starts right here.
Step 1: Form C
Form C will be the first pattern that we investigate. Following the diagram is quite simple: start at the lowest root note (labeled "R"), play up the scale past the next root, all the way to the top of the pattern, then start descending. When you descend, play the scale all the way past the first root, down to the bottom of the pattern, then go back up the pattern and stop at the root note that you started with.
For the sake of convenience, this entire tutorial will be based on the key of D major. Just to clarify, the form IS called Form C, even though its in the key of D. The reason it is called Form C is that if you slide the pattern down to open position, you will see the open C major chord in the pattern.
Anyway, now that we have established that we are playing in D major, it is obvious that the root note must be D. For this pattern, start with your fourth finger (pinky) on the fifth fret of the A string.
Step 2: Form A
Form A, like Form C, will start on the fifth fret of the A string. With Form A, however, you start with your second (middle) finger. It is called Form A because if you shift it down to open position, you can see the open A major chord in the pattern.
Learning this pattern is slightly more tricky than Form C because a shift is required when moving from the G string to the B string. So, start at the bottom root note, and work your way up the pattern. When you play the notes on the G string, you will use your first (index) finger, your third (ring) finger, and your fourth (pinky) finger. You will then shift up a fret by using your index finger on the next note. Once you reach the top of the pattern, start descending.
On the B string, you will use your fourth finger, third finger, and first finger, and then use your pinky on the first note you play on the G string in order to shift back down a fret. From there, play the rest of the pattern all the way to the bottom, and then back up to the root.
Step 3: Form G
Form G is possibly the most difficult pattern in the CAGED system. It has not only one shift, but two shifts: both down a fret and up a fret. You start it with your fourth (pinky) finger on the tenth fret of the low E string. The notes on the D string will be played with your first (index) finger and your fourth (pinky) finger in order to shift down a fret on the next string.
The G string is the only one string that is shifted down a fret, so in order to shift back up a fret on the B string, you will play the notes on the G string with your first (index), second (middle), and fourth (pinky) fingers. The first note on the B string will be played with your first (index) finger. Once you reach the top of the pattern, start descending. Descending from the B string to the G string entails using your fourth (pinky) finger on the first note of the G string.
After playing the third note on the G string with your first (index) finger, use your fourth finger and first finger on the D string. Start descending on the A string with your fourth finger. Play to the bottom of the pattern, and back up to the root.
Step 4: Form E
Form E is probably the most basic pattern due to the fact that there are no shifts. It starts with your second finger on the tenth fret. Quite simply, make your way up to the top, and come back down, then up to the root.
Just in case your not sure, the notes on the B string are supposed to be played with your second and fourth finger, and NOT your first and third or first and fourth. By using your second and fourth fingers, you will be disciplining yourself and teaching yourself to use a finger pattern that is not as easy or comfortable, thus making you more flexible and dextrous as you practice it.
Step 5: Form D
The D form is the fifth and final major scale pattern in the CAGED system. Like the G form, it too shifts both down a fret and up a fret. Unlike any other form, however, it starts on the D string.
The first note of this pattern is to be played with your second finger on the seventh fret of the D string. After you play the third note on the G string, shift up and play the first note on the B string with your first finger. Play the rest of the scale up and then start descending.
After playing the third note down on the B string, play the top note of the G string with your index finger. Play the notes on the G and the D string. In order to shift down a fret, you will play the notes on the A string with your fourth and first finger, and then you'll play the first note on the E string with your pinky. Play the notes on the E string, and go back up to the root, but remember that the A string notes are to be played with the first and fourth fingers in order to shift.
You now know all five major scale patterns! These patterns allow you to play all over the fretboard, and as long as you remember which pattern you're in, you'll never hit a wrong note! Although you know these patterns, there is still much more to learn, such as comprehensive scales and modes. Even though this is only the beginning of a long process, it is still a HUGE step forward. Good luck!