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A

A or La is the sixth note and the tenth semitone of the fixed-do solfège. Its enharmonic equivalents are B♭♭ (B double flat) which is a diatonic semitone above A♭ and Gdouble sharp (G double sharp) which is a diatonic semitone below A♯. 'A' is generally used as a standard for tuning. When the orchestra tunes, the oboe plays an 'A' and the rest of the instruments tune to match that pitch. Every string instrument in the orchestra has an A string, from which each player can tune the rest of their instrument. 'A' is also used in combination with a number (e.g. A-440) to label the pitch standard. The number designates the frequency in hertz. A lower number equals a lower pitch.

A#

A#7

A#9

A#aug

A#dim

A#min

A#min7

A7

In music theory, a dominant seventh chord, or major minor seventh chord, is a seventh chord, usually built on the fifth degree of the major scale, and composed of a root, major third, perfect fifth, and minor seventh. Thus it is a major triad together with a minor seventh, denoted by the letter name of the chord root and a superscript '7'. An example is the dominant seventh chord built on G, written as G7, having pitches G–B–D–F:

A9

In music theory, a ninth chord is a chord that encompasses the interval of a ninth when arranged in close position with the root in the bass.

Aaug

An augmented triad is a chord, made up of two major thirds (an augmented fifth). The term augmented triad arises from an augmented triad being considered a major chord whose top note (fifth) is raised. When using popular-music symbols, it is indicated by the symbol '+' or 'aug'. For example, the augmented triad built on C, written as C+, has pitches C–E–G♯:

Adim

In music theory, a diminished triad (also known as the minor flatted fifth[citation needed]) is a triad consisting of two minor thirds above the root. It is a minor triad with a lowered (flattened) fifth. When using chord symbols, it may be indicated by the symbols 'dim', 'o', 'm♭5', or 'MI(♭5)'. However, in most popular-music chord books, the symbol 'dim' and 'o' represents a diminished seventh chord (a four-tone chord), which in some modern jazz books and music theory books is represented by the 'dim7' or 'o7' symbols.

Amin

In music theory, a minor chord is a chord that has a root, a minor third, and a perfect fifth. When a chord comprises only these three notes, it is called a minor triad. For example, the minor triad built on C, called a C minor triad, has pitches C–E♭–G:

Amin7

In music, a minor seventh chord is a seventh chord composed of a root note, together with a minor third, a perfect fifth, and a minor seventh (1, ♭3, 5, ♭7). For example, the minor seventh chord built on C, commonly written as C–7, has pitches C–E♭–G–B♭:

B

B7

B9

Baug

Bdim

Bmin

Bmin7

C

C#

C#7

C#9

C#aug

C#dim

C#min

C#min7

C7

C9

Caug

Cdim

Cmin

Cmin7

D

D#

D#7

D#9

D#aug