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Using lead sheet chord names, these chords could be referred to as A minor, D minor, G major and C major. [ 1 ] In music theory , Roman numeral analysis is a type of harmonic analysis in which chords are represented by Roman numerals , which encode the chord's degree and harmonic function within a given musical key .
The destination of a chord progression is known as a cadence, or two chords that signify the end or prolongation of a musical phrase. The most conclusive and resolving cadences return to the tonic or I chord; following the circle of fifths , the most suitable chord to precede the I chord is a V chord.
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).
Minor chords are noted with a dash after the number or a lowercase m; in the key of D, 1 is D major, and 4- or 4m would be G minor. Often in the NNS, songs in minor keys will be written in the 6- of the relative major key. So if the song was in G minor, the key would be listed as B ♭ major, and G minor chords would appear as 6-.
The implementation of chords using particular tunings is a defining part of the literature on guitar chords, which is omitted in the abstract musical-theory of chords for all instruments. For example, in the guitar (like other stringed instruments but unlike the piano ), open-string notes are not fretted and so require less hand-motion.
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the nickname ("Acka Dacka") for AC/DC, used in the guitar riff for the band's 1977 song Whole Lotta Rosie A, D, A, A, F (= A, L, A, I, N ) for Jehan Alain , used by Maurice Duruflé in his Prélude et Fuge sur le nom d'Alain (op. 7) and derived on the French system but leaving H = B-natural and starting the second line with 'I'
Since most other chords are made by adding one or more notes to these triads, the name and symbol of a chord is often built by just adding an interval number to the name and symbol of a triad. For instance, a C augmented seventh chord is a C augmented triad with an extra note defined by a minor seventh interval: