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Guitar chord. Ry Cooder plays slide guitar using an open tuning that allows major chords to be played by barring the strings anywhere along their length. In music, a guitar chord is a set of notes played on a guitar. A chord's notes are often played simultaneously, but they can be played sequentially in an arpeggio.
Barre chord. A barre chord ("A♯ minor"), with the index finger used to bar the strings. A, E major barre chord, then open E major chord. Play open E-major chord arpeggio, then barre, then open ⓘ. In music, a barre chord (also spelled bar chord) is a type of chord on a guitar or other stringed instrument played by using one finger to press ...
The twelve-bar blues (or blues changes) is one of the most prominent chord progressions in popular music. The blues progression has a distinctive form in lyrics, phrase, chord structure, and duration. In its basic form, it is predominantly based on the I, IV, and V chords of a key. Mastery of the blues and rhythm changes are "critical elements ...
Eight-bar blues progressions have more variations than the more rigidly defined twelve bar format. The move to the IV chord usually happens at bar 3 (as opposed to 5 in twelve bar); however, "the I chord moving to the V chord right away, in the second measure, is a characteristic of the eight-bar blues." [1]
It is played very slowly and freely, with Vaughan alternating between jazz-inflected chords and solo runs. The main chord featured in the song is a movable major 6th chord to which Vaughan applies moderate vibrato with the tremolo bar. The solos incorporate the E major scale, the E minor pentatonic scale, and the E Minor blues scale.
There are few keys in which one may play the progression with open chords on the guitar, so it is often portrayed with barre chords ("Lay Lady Lay"). The use of the flattened seventh may lend this progression a bluesy feel or sound, and the whole tone descent may be reminiscent of the ninth and tenth chords of the twelve bar blues (V–IV).