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2. Piano key frequencies - Wikipedia

   en.wikipedia.org/wiki/Piano_key_frequencies

   Piano key frequencies. This is a list of the fundamental frequencies in hertz (cycles per second) of the keys of a modern 88-key standard or 108-key extended piano in twelve-tone equal temperament, with the 49th key, the fifth A (called A 4), tuned to 440 Hz (referred to as A440). [1][2] Every octave is made of twelve steps called semitones. A ...

3. Chord (music) - Wikipedia

   en.wikipedia.org/wiki/Chord_(music)

   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). This numbering indicates the chords's ...

4. Chord progression - Wikipedia

   en.wikipedia.org/wiki/Chord_progression

   Chord progressions are the foundation of popular music styles (e.g., pop music, rock music), traditional music, as well as genres such as blues and jazz. In these genres, chord progressions are the defining feature on which melody and rhythm are built. In tonal music, chord progressions have the function of either establishing or otherwise ...

5. List of chords - Wikipedia

   en.wikipedia.org/wiki/List_of_chords

   List of set classes. Ninth chord. Open chord. Passing chord. Primary triad. Quartal chord. Root (chord) Seventh chord. Synthetic chord.

6. Key (music) - Wikipedia

   en.wikipedia.org/wiki/Key_(music)

   Key (music) In music theory, the key of a piece is the group of pitches, or scale, that forms the basis of a musical composition in Western classical music, art music, and pop music. Tonality (from "Tonic") or key: Music which uses the notes of a particular scale is said to be "in the key of" that scale or in the tonality of that scale.

7. Major and minor - Wikipedia

   en.wikipedia.org/wiki/Major_and_minor

   In Western music, the adjectives major and minor may describe an interval, chord, scale, or key. A composition, movement, section, or phrase may also be referred to by its key, including whether that key is major or minor. The words derive from Latin words meaning "large" and "small," and were originally applied to the intervals between notes ...