Minor seventh in the context of "Half-diminished seventh chord"

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 its corresponding symbol typically indicate one or more of the following:

• the root note (e.g. C♯)
• the chord quality (e.g. minor or lowercase m, or the symbols 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. )
• any altered notes (e.g. sharp five, or ♯5)
• any added tones (e.g. )
• the bass note if it is not the root (e.g. a slash chord)

For instance, the name C augmented seventh, and the corresponding symbol C, or C, are both composed of parts 1 (letter 'C'), 2 ('aug' or '+'), and 3 (digit '7'). These indicate a chord formed by the notes C–E–G–B. The three parts of the symbol (C, aug, and ) refer to the root C, the augmented (fifth) interval from C to G♯, and the (minor) seventh interval from C to B♭.

In music theory, a dominant seventh chord, or major minor seventh chord, is a seventh chord composed of a root, major third, perfect fifth, and minor seventh; thus it is a major triad together with a minor seventh. It is often denoted by the letter name of the chord root and a superscript "7". In most cases, dominant seventh chord are built on the fifth degree of the major scale. An example is the dominant seventh chord built on G, written as G, having pitches G–B–D–F:

The leading note and the subdominant note combined form a diminished fifth, also known as a tritone. The clashing sound produced by playing these two notes together gives the dominant seventh chord its dissonant quality (i.e. its harmonic instability).

In classical music from Western culture, a diminished seventh (play) is an interval produced by narrowing a minor seventh by a chromatic semitone, and its inversion is the augmented second. For instance, the interval from A to G is a minor seventh, ten semitones wide, and both the intervals from A♯ to G, and from A to G♭ are diminished sevenths, spanning nine semitones. Being diminished, it is considered a dissonant interval.

The diminished seventh is used quite readily in the minor key, where it is present in the harmonic minor scale between the seventh scale step and the sixth scale step in the octave above.

A seventh chord is a chord consisting of a triad plus a note forming an interval of a seventh above the chord's root. When not otherwise specified, a "seventh chord" usually means a dominant seventh chord: a major triad together with a minor seventh. However, a variety of sevenths may be added to a variety of triads, resulting in many different types of seventh chords.

In its earliest usage, the seventh was introduced solely as an embellishing or nonchord tone. The seventh destabilized the triad, and allowed the composer to emphasize movement in a given direction. As time passed and the collective ear of the western world became more accustomed to dissonance, the seventh was allowed to become a part of the chord itself, and in some modern music, jazz in particular, nearly every chord is a seventh chord. Additionally, the general acceptance of equal temperament during the 19th century reduced the dissonance of some earlier forms of sevenths.

The augmented seventh chord, or seventh augmented fifth chord, or seventh sharp five chord is a seventh chord composed of a root, major third, augmented fifth, and minor seventh (1, 3, ♯5, ♭7). It can be viewed as an augmented triad with a minor seventh. When using popular-music symbols, it is denoted by +, aug, or . For example, the augmented seventh chord built on A♭, written as A♭+, has pitches A♭-C-E-G♭:

The chord can be represented by the integer notation {0, 4, 8, 10}.

The A-flat (A♭) clarinet is the highest-pitched instrument of the clarinet family still manufactured. It is just over half the length of the common B♭ clarinet and pitched a minor seventh higher, a perfect fourth higher than the E♭ clarinet. As a transposing instrument it sounds a minor sixth higher than written, thus the lowest written note E₃ sounds as concert C₄ (middle C).Around the beginning of the 19th century, several small clarinets in different pitches appeared. The A♭ clarinet was adopted in European wind bands, particularly in Italy where it has appeared in Verdi's opera banda parts and survived to the present day in military bands. It is sometimes called for in contemporary classical music, in works by composers Béla Bartók and John Tavener, and in large clarinet choir works. It is manufactured by Italian makers Ripamonti, Mario Corso, and Orsi, and in Germany by Dietz Klarinettenbau (in G), Foag Klarinetten, Herbert Wurlitzer, and Schwenk & Seggelke.