the "A" shaped D major in fifth position. Variations of the basic major and minor triad chords can also be formed using the barred chord as their foundation. For example, the open Cadd9 shape can be used in its C shape barre form up the guitar neck, as desired. CAGED System The CAGED system is an acronym for the chords C, A, G, E, and D. This acronym is shorthand for the use of barre chords that can be played anywhere on the fret board as described above. Some guitar instructors use it to teach students the open chords that can work as barre chords across the fret board. By replacing the nut with a full barre, a player can use the chord shapes for C, A, G, E, and D anywhere on the fret board to play any major chord in any key. CAGED is also a mnemonic for the sequence that a chord appears in as it moves up the neck; for example, C Major can be played as an open C-shape chord at the nut, as an A-shape chord barred at the third fret, as a G-shape barred at the fifth fret, as an E-shape barred at the eighth fret, and as a D-shape barred at the 10th fret. Similarly, G Major can be played as an open G-shaped chord and the next shape in which the chord appears is as an E-shape (barred at the third fret), followed by the D-shape (barred at the 5th fret); the CAGED pattern then begins again with a C-shape barred at the 7th fret, an A-shape at the 10th fret, and so on. The same cycle can be applied to all other chord types. Learning the five movable C-, A-, G-, E-, and D-shapes of, say, a dominant 7th chord in effect allows the player to learn 60 chords, since each of the five shapes can be positioned so that any of the 12 chromatic notes is the root note. This system also provides a way to remember scale shapes, though some debate the usefulness of this teaching method due to potential technical problems. Use in popular music The use of the leading-tone imperfect authentic cadence (VII-I) in popular music is often attributed to the ease of sliding a barre chord up two frets. In the context of classical music, Fernando Sor recommends using barring and shifting sparingly. His principal