The A barre chord, commonly called the "double barre", is made by sliding the A chord shape (X02220) up and down the frets. When the A chord is barred, the index finger lies across the top five strings, touching the 6th string (E) to deaden it. Either the ring or little finger is then barred across the 2nd (B), 3rd (G), and 4th (D) strings two frets down, or one finger frets each string. For instance, if barred at the second fret, the A chord becomes B (X24442). From fret one to twelve, the barred A becomes B♭, B, C, C♯, D, E♭, E, F, F♯, G, A♭, and at the twelfth fret (that is, one octave up), it is A again.
The two most commonly barred notes are variations of A and E. These barre chords are most common in rock, blues and country music. The E barre chord is made of an E chord shape (022100) moved up and down the frets and being barred, changing the note. For example, the E chord barred one fret up becomes an F chord (133211). The next fret up is F♯, followed by G, A♭, A, B♭, B, C, C♯, D, E♭, and then back to E (1 octave up) at fret twelve.
When fretting a barre chord, because the strings are no longer open, they do not resonate as brightly or long as an open chord. The sound is muted by the pressure placed on the bar; heavy pressure in the center of the frets produces less muting. Therefore, when playing barre chords, it is important to practice maintaining adequate pressure, as the technique is tiring for beginners and the strings dig into the flesh of the uncalloused finger.
In music, a barre chord (also known as bar chord or rarely barr chord) is a type of guitar chord, where one or more fingers are used to press down multiple strings across the guitar fingerboard (like a bar pressing down the strings), enabling the guitarist to play a chord not restricted by the tones of the guitar's open strings. Barre chords are often referred to as "moveable" chords, as the whole hand may easily be moved up and down the neck, "in one movement". Commonly used in most popular and classical music, they are frequently used in combination with "open" or standard guitar chords.