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An upper case numeral that is not followed by a symbol is understood as a major chord. The use of Roman numerals enables the rhythm section performers to play the song in any key requested by the bandleader or lead singer. The accompaniment performers translate the Roman numerals to the specific chords that would be used in a given key.
In music, a major seventh chord is a seventh chord in which the third is a major third above the root and the seventh is a major seventh above the root. The major seventh chord, sometimes also called a Delta chord, can be written as maj 7, M 7, Δ, ⑦, etc. The "7" does not have to be superscripted, but if it is, then any alterations, added ...
Of the seven notes in the major scale, a seventh chord uses only four (the root, third, fifth, and seventh). The other three notes (the second, fourth, and sixth) can be added in any combination; however, just as with the triads and seventh chords, notes are most commonly stacked – a seventh implies that there is a fifth and a third and a root.
For instance, in the C major scale, G is the fifth note of the scale, and the seventh chord built on G is the dominant seventh chord, G 7 (shown above). In this chord, F is a minor seventh above G. In Roman numeral analysis, G 7 would be represented as V 7 in the key of C major.
The seventh chords built on each scale degree follow a distinct pattern. The roman numeral analysis is shown in parentheses. 1st: Major seventh chord (IM 7) 2nd: minor seventh chord (ii 7) 3rd: minor seventh chord (iii 7) 4th: Major seventh chord (IVM 7) 5th: Dominant seventh chord (V 7) 6th: minor seventh chord (vi 7) 7th: half-diminished ...
A major seventh chord contains the notes: root, 3, 5, M7, (9). The symbols M7 and Δ7 have the same meaning as maj 7 or just Δ. Often melody notes or other pitches influence an improviser's choice of chord types. For example, if the melody note is the root of the chord, including a major seventh can cause dissonance.
A C major chord, the major triad built on the note C (C–E–G), is referred to as the one chord of that key and notated in Roman numerals as I. The same C major chord can be found in other scales: it forms chord III in the key of A minor (A→B→C) and chord IV in the key of G major (G→A→B→C). This numbering indicates the chords's ...
Besides the dominant seventh chords discussed above, other seventh chords—especially minor seventh chords and major seventh chords—are used in guitar music. Minor seventh chords have the following fingerings in standard tuning: Dm7: [XX0211] Em7: [020000] Am7: [X02010] Bm7: [X20202] F ♯ m7: [202220] or ([XX2222] Also an A/F ♯ Chord)