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A major triad has a major third (M3) on the bottom, a minor third (m3) on top, and a perfect fifth (P5) between the outer notes. In harmonic analysis and on lead sheets, a C major chord can be notated as C, CM, CΔ, or Cmaj. A major triad is represented by the integer notation {0, 4, 7}.
Triads (or any other tertian chords) are built by superimposing every other note of a diatonic scale (e.g., standard major or minor scale). For example, a C major triad uses the notes C–E–G. This spells a triad by skipping over D and F. While the interval from each note to the one above it is a third, the quality of those thirds varies ...
the root note (e.g. C ♯) the chord quality (e.g. minor or lowercase m, or the symbols o or + for diminished and augmented chords, respectively; chord quality is usually omitted for major chords) whether the chord is a triad, seventh chord, or an extended chord (e.g. Δ 7) any altered notes (e.g. sharp five, or ♯ 5) any added tones (e.g. add2)
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).
Another variation of the major triad changes the order of the notes: For example, the C-major triad is often played as (C,G,E), where (C,G) is a perfect fifth and E is raised an octave above the perfect third (C,E). Alternative orderings of the notes in a triad are discussed below (in the discussions of chord inversions and drop-2 chords).
A "common chord" may also be defined simply as a triadic chord [2] (e.g., C–E–G), as one of the most commonly used chords in a key (I–IV–V–vi–ii–iii), [3] more narrowly as a triad in which the fifth is perfect (i.e., a major or minor triad), in which sense it is alternatively referred to as a "perfect chord" [4] [5] or, more ...
The triads built on each scale degree follow a distinct pattern. The roman numeral analysis is shown in parentheses. 1st: Major triad (I) 2nd: minor triad (ii) 3rd: minor triad (iii) 4th: Major triad (IV) 5th: Major triad (V) 6th: minor triad (vi) 7th: diminished triad (vii o)
A drop-2 voicing lowers the second voice by an octave. For example, a C-major triad has three "drop-2 voicings". Reading down from the top voice, they are C E G, E G C, and G C E, which can be heard as the voicings supporting the first three melody notes (following the introductory phrase) of the Super Mario Bros. video game theme. [18]