Flat (music) in the context of "Musical key"

In Western musical notation, a key signature is a set of sharp (♯), flat (♭), or rarely, natural (♮) symbols placed on the staff at the beginning of a section of music. The initial key signature in a piece is placed immediately after the clef at the beginning of the first line. If the piece contains a section in a different key, the new key signature is placed at the beginning of that section.

In a key signature, a sharp or flat symbol on a line or space of the staff indicates that the note represented by that line or space is to be played a semitone higher (sharp) or lower (flat) than it would otherwise be played. This applies through the rest of the piece or until another key signature appears. Each symbol applies to comparable notes in all octaves—for example, a flat on the fourth space of the treble staff (as in the diagram) indicates that all notes notated as Es are played as E-flats, including those on the bottom line of the staff.

In music, intonation is the pitch accuracy of a musician or musical instrument. Intonation may be flat, sharp, or both, successively or simultaneously.

In vocal music, intonation also signifies the singing of an opening phrase.

The major scale (or Ionian mode) is one of the most commonly used musical scales, especially in Western music. It is one of the diatonic scales. Like many musical scales, it is made up of seven notes: the eighth duplicates the first at double its frequency so that it is called a higher octave of the same note (from Latin "octavus", the eighth).

The simplest major scale to write is C major, the only major scale not requiring sharps or flats:

In music, sharp – eqv. dièse (from French) or diesis (from Greek δίεσις) – means higher in pitch. In the standard tuning system for Western music (12 equal temperament), the sharp symbol, ♯, indicates that the note to which the symbol is applied is played one semitone higher. If the two pitches have the same letter name, such as C natural and C sharp, the interval may be referred to as an augmented unison. The opposite of sharp is flat, indicating a lowering of pitch. The symbol derives from a square form of the letter b.
Cite error: There are <ref group=lower-alpha> tags or {{efn}} templates on this page, but the references will not show without a {{reflist|group=lower-alpha}} template or {{notelist}} template (see the help page).

In modern Western music notation, a natural (♮) is a musical symbol that cancels a previous sharp or flat on a note in the written music. The natural indicates that the note is at its unaltered pitch.

The natural symbol can be used as an accidental to cancel sharps or flats on an individual note. It may also be shown in a key signature to indicate that sharps or flats in a previous key signature are cancelled.

D minor is a minor scale based on D, consisting of the pitches D, E, F, G, A, B♭, and C. Its key signature has one flat. Its relative major is F major and its parallel major is D major.

The D natural minor scale is:

In music theory, a major scale and a minor scale that have the same starting note (tonic) are called parallel keys and are said to be in a parallel relationship. For example, G major and G minor have the same tonic (G) but have different modes, so G minor is the parallel minor of G major. This relationship is different from that of relative keys, a pair of major and minor scales that share the same notes but start on different tonics (e.g., G major and E minor).

A major scale can be transformed to its parallel minor by lowering the third, sixth, and seventh scale degrees, and a minor scale can be transformed to its parallel major by raising those same scale degrees.

In musical notation, an accidental is a symbol that indicates an alteration of a given pitch. The most common accidentals are the flat (♭) and the sharp (♯), which represent alterations of a semitone, and the natural (♮), which cancels a sharp or flat. Accidentals alter the pitch of individual scale tones in a given key signature; the sharps or flats in the key signature itself are not called accidentals.

An accidental applies to the note that immediately follows it and to subsequent instances of that note in the same measure, unless it is canceled by another accidental. A sharp raises a note's pitch by a semitone and a flat lowers it by a semitone. Double flats () or sharps () may also be used, altering the unmodified note by two semitones. If a note with an accidental is tied, the accidental continues to apply, even if the note it is tied to is in the next measure. If a note has an accidental and the note is repeated in a different octave, notation conventions vary. In modern notation, an accidental should be indicated on the second note to clarify, but some older notation assumes that the initial accidental applies across octaves.

C major is a major scale based on C, consisting of the pitches C, D, E, F, G, A, and B. C major is one of the most common keys used in music. Its key signature has no flats or sharps. Its relative minor is A minor and its parallel minor is C minor.

E-flat major is a major scale based on E♭, consisting of the pitches E♭, F, G, A♭, B♭, C, and D. Its key signature has three flats. Its relative minor is C minor, and its parallel minor is E♭ minor, (or enharmonically D♯ minor).

The E♭ major scale is:

B-flat minor is a minor scale based on B♭, consisting of the pitches B♭, C, D♭, E♭, F, G♭, and A♭. Its key signature has five flats. Its relative major is D-flat major and its parallel major is B-flat major. Its enharmonic equivalent, A-sharp minor, which would contain seven sharps, is not normally used.

The B-flat natural minor scale is:

A minor is a minor scale based on A, B, C, D, E, F, and G. Its key signature has no flats or sharps. Its relative major is C major and its parallel major is A major.

The A natural minor scale is:

C minor is a minor scale based on C, consisting of the pitches C, D, E♭, F, G, A♭, and B♭. Its key signature consists of three flats. Its relative major is E♭ major and its parallel major is C major.

The C natural minor scale is:

F major is a major scale based on F, with the pitches F, G, A, B♭, C, D, and E. Its key signature has one flat. Its relative minor is D minor and its parallel minor is F minor.

Masonic music has been defined as "music used in connection with the ritual and social functions of freemasonry." Two major types of music used in masonic lodges are lodge songs, played to keyboard accompaniment before or after meetings, or during meals; and music written to accompany specific masonic ceremonies and events. Because the number 3 and the letter 'B' are of particular significance to freemasonry, music written in the keys of C minor or E flat major, which both involve 3 flats, (whose symbol '♭' resembles the lowercase letter 'b'), in their key signatures has been considered especially appropriate for masonic ceremonial music.

Although there had been earlier examples, like Jean-Philippe Rameau's opera Zoroastre (1749), whose librettist Louis de Cahusac was a Freemason, the masonic music of Wolfgang Amadeus Mozart is among the best-known of its kind. Mozart's opera The Magic Flute and his incidental music to Thamos, King of Egypt have masonic connections. Other openly masonic compisitions by Mozart include the Maurerische Trauermusik (Masonic Funeral Music) and a number of songs and cantatas.