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  2. Intersecting chords theorem - Wikipedia

    en.wikipedia.org/wiki/Intersecting_chords_theorem

    In Euclidean geometry, the intersecting chords theorem, or just the chord theorem, is a statement that describes a relation of the four line segments created by two intersecting chords within a circle. It states that the products of the lengths of the line segments on each chord are equal. It is Proposition 35 of Book 3 of Euclid 's Elements.

  3. Chord (geometry) - Wikipedia

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

    Chord (geometry) A chord (from the Latin chorda, meaning "bowstring") of a circle is a straight line segment whose endpoints both lie on a circular arc. If a chord were to be extended infinitely on both directions into a line, the object is a secant line. The perpendicular line passing through the chord's midpoint is called sagitta (Latin for ...

  4. Chord chart - Wikipedia

    en.wikipedia.org/wiki/Chord_chart

    A chord chart (or chart) is a form of musical notation that describes the basic harmonic and rhythmic information for a song or tune. It is the most common form of notation used by professional session musicians playing jazz or popular music. It is intended primarily for a rhythm section (usually consisting of piano, guitar, drums and bass ).

  5. I–V–vi–IV progression - Wikipedia

    en.wikipedia.org/wiki/I–V–vi–IV_progression

    vi–IV–I–V chord progression in C Play ⓘ. The I–V–vi–IV progression is a common chord progression popular across several genres of music. It uses the I, V, vi, and IV chords of a musical scale. For example, in the key of C major, this progression would be C–G–Am–F. [ 1] Rotations include: I–V–vi–IV : C–G–Am–F. V ...

  6. Chord notation - Wikipedia

    en.wikipedia.org/wiki/Chord_notation

    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 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 aug7, or C +7, are both composed of parts 1 (letter 'C ...

  7. 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.

  8. Chord progression - Wikipedia

    en.wikipedia.org/wiki/Chord_progression

    In a musical composition, a chord progression or harmonic progression (informally chord changes, used as a plural) is a succession of chords. Chord progressions are the foundation of harmony in Western musical tradition from the common practice era of Classical music to the 21st century. Chord progressions are the foundation of popular music ...

  9. Piano - Wikipedia

    en.wikipedia.org/wiki/Piano

    The piano is a keyboard instrument that produces sound when its keys are depressed, through engagement of an action whose hammers strike strings. Modern pianos have a row of 88 black and white keys, tuned to a chromatic scale in equal temperament . There are two main types of piano: the grand piano and the upright piano.

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