CHORD NAMES, SYMBOLS AND QUALITIES
Musicians use
various kinds of chord names and symbols in different contexts, to represent
musical chords. In most genres of popular music, including jazz, pop, and rock,
a chord name and the corresponding symbol are typically composed of one or more
of the following parts:
1.
The root note (e.g., C).
2.
The chord quality (e.g., major, maj, or M).
3.
The number of an interval (e.g., seventh, or 7),
or less often its full name or symbol (e.g., major seventh, maj7, or M7).
4.
The
altered fifth (e.g., sharp five, or ♯5).
5.
An additional interval number (e.g., add 13 or
add13), in added tone chords.
For instance,
the name C augmented seventh, and the corresponding symbol Caug7, or C+7, are
both composed of parts 1, 2, and 3.
More rarely, a bass note other than the
root (e.g., In the key of C Major, "G/B bass", which means a G Major
chord with a "B" as the bass note). Except for the root, these parts
do not refer to the notes that form the chord, but to the intervals they form
with respect to the root note. For instance, Caug7 indicates a chord formed by
the notes C-E-G♯-B♭.
The three parts of the symbol (C, aug, and 7) refer to the root C, the
augmented (fifth) interval from C to G♯,
and the (minor) seventh interval from C to B♭. A set of decoding rules
is applied to deduce the missing information. Although they are used
occasionally in classical music, typically in an educational setting for
harmonic analysis, these names and symbols are "universally used in jazz
and popular music", in lead sheets, fake books, and chord charts, to
specify the chords that make up the chord progression of a song or other piece
of music. A typical sequence of a jazz or rock song in the key of C Major might
indicate a chord progression such as "C Maj/a minor/d minor/G7".
Musicians use
various kinds of chord names and symbols in different contexts, to represent
musical chords. In most genres of popular music, including jazz, pop, and rock,
a chord name and the corresponding symbol are typically composed of one or more
of the following parts: