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Dotted notes and their equivalent durations. The curved lines, called ties, add the note values together. In Western musical notation, a dotted note is a note with a small dot written after it. [a] In modern practice, the first dot increases the duration of the basic note by half (the original note with an extra beam) of its original value.
A note value may be augmented by adding a dot after it. This dot adds the next briefer note value, making it one and a half times its original duration. A number of dots ( n ) lengthen the note value by 2 n − 1 / 2 n its value, so two dots add two lower note values, making a total of one and three quarters times its original duration.
Dashes after a note lengthen it, each dash by the length of a quarter note. A dot after the plain or underlined note works increases its length by half, and two dots by three quarters. The underline, along with its joining, are analogous to the number of flags and beaming in standard notation. So are dotted notes.
There may be any number of beats in a measure but the most common by far are multiples of 2 or 3 (i.e., a top number of 2, 3, 4, or 6). Likewise, any note length can be used to represent a beat, but a quarter note (indicated by a bottom number of 4) or eighth note (bottom number of 8) are by far the most common.
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.
Notes in it include a prime symbol below the note's letter. Names of subsequent lower octaves are preceded with "sub". Notes in each include an additional prime symbol below the note's letter. The octave starting at tenor C is called the "small" octave. Notes in it are written as lower case letters, so tenor C itself is written c in Helmholtz ...
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The time value of some notes could change according to their immediate context in certain situations. The rules for this were developed on the basis of the typical rhythmic nature of music in the 13th century. Most music at that time followed the same basic metric pattern, which in modern notation would be written as a swift 6 4 (or 6 8) meter. [8]