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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.

  3. List of musical symbols - Wikipedia

    en.wikipedia.org/wiki/List_of_musical_symbols

    This example shows that each measure is the length of three quarter notes (crotchets). 3 4 is pronounced as "three-four" or "three-quarter time". Compound time signatures In a compound meter, there is an additional rhythmic grouping within each measure. This example shows 6 8 time, indicating 6 beats per measure, with an eighth note ...

  4. Scale of chords - Wikipedia

    en.wikipedia.org/wiki/Scale_of_Chords

    A chord is a line drawn between two points on the circumference of a circle. Look at the centre point of this line. For a circle of radius r, each half will be ⁡ so the chord will be ⁡. The line of chords scale represents each of these values linearly on a scale running from 0 to 60.

  5. Chord (geometry) - Wikipedia

    en.wikipedia.org/wiki/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 "arrow").

  6. Musical notation - Wikipedia

    en.wikipedia.org/wiki/Musical_notation

    Jeongganbo is a traditional musical notation system created during the time of Sejong the Great that was the first East Asian system to represent rhythm, pitch, and time. [ 20 ] [ 21 ] Among various kinds of Korean traditional music, Jeong-gan-bo targets a particular genre, Jeong-ak ( 정악, 正樂 ).

  7. Music theory - Wikipedia

    en.wikipedia.org/wiki/Music_theory

    The Oxford Companion to Music describes three interrelated uses of the term "music theory": The first is the "rudiments", that are needed to understand music notation (key signatures, time signatures, and rhythmic notation); the second is learning scholars' views on music from antiquity to the present; the third is a sub-topic of musicology ...

  8. Chord (music) - Wikipedia

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

    A guitarist performing a C chord with G bass. In Western music theory, a chord is a group [a] of notes played together for their harmonic consonance or dissonance.The most basic type of chord is a triad, so called because it consists of three distinct notes: the root note along with intervals of a third and a fifth above the root note. [1]

  9. Time signature - Wikipedia

    en.wikipedia.org/wiki/Time_signature

    Most time signatures consist of two numerals, one stacked above the other: The lower numeral indicates the note value that the signature is counting. This number is always a power of 2 (unless the time signature is irrational), usually 2, 4 or 8, but less often 16 is also used, usually in Baroque music. 2 corresponds to the half note (minim), 4 to the quarter note (crotchet), 8 to the eighth ...