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A whole tone is a secondary interval, being derived from two perfect fifths minus an octave, (3:2) 2 /2 = 9:8. The just major third, 5:4 and minor third, 6:5, are a syntonic comma , 81:80, apart from their Pythagorean equivalents 81:64 and 32:27 respectively.
The duration (note length or note value) is indicated by the form of the note-head or with the addition of a note-stem plus beams or flags. A stemless hollow oval is a whole note or semibreve, a hollow rectangle or stemless hollow oval with one or two vertical lines on both sides is a double whole note or breve.
Printable version; In other projects ... out of 2 total. M. Musical tuning (13 C, 51 P) S. Musical set theory (1 C, 23 P) Pages in category "Mathematics of music"
Lengths of arcs of the circle, in degrees, and the integer parts of chord lengths, were expressed in a base 10 numeral system that used 21 of the letters of the Greek alphabet with the meanings given in the following table, and a symbol, "∠′ ", that means 1 / 2 and a raised circle " " that fills a blank space (effectively ...
[c] The difficulty may be seen by comparing dotted notation to tied notation: a quarter note is equivalent to 2 tied eighth notes (), a dotted quarter = 3 tied eighth notes, double dotted = 7 tied sixteenth notes (), triple dotted = 15 tied thirty-second notes (), and quadruple dotted = 31 tied sixty-fourth notes (). Although shorter notes do ...
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In geometry, a disk (also spelled disc) [1] is the region in a plane bounded by a circle. A disk is said to be closed if it contains the circle that constitutes its boundary, and open if it does not. [2] For a radius, , an open disk is usually denoted as and a closed disk is ¯.
The earliest multi-track records, issued around 1919 by Grey Gull Records, were vertically cut 78 rpm discs known as "2-in-1" records. These had finer grooves than usual, like Edison Disc Records . By 1949, when the 45 rpm single and 33 1 ⁄ 3 rpm LP were competing formats, 7-inch 45 rpm singles had a maximum playing time of only about four ...