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In music, a double whole note (American), breve (international), or double note is a note lasting two times as long as a whole note (or ''semibreve''). In medieval mensural notation, the ''brevis'' (ancestor of the modern breve) was one of the shortest note lengths—hence its name, which is the Latin etymon of "brief" . In "perfect" rhythmic mode, the brevis was a third of a ''longa'', or in "imperfect" mode half a ''longa'' (for full details of the complications here, see for example ). However, in modern music notation it is the longest note value still in common use . In modern notation, a breve is represented in two ways: by a hollow oval note head, like a whole note, with one or two vertical lines on either side, as on the left of the image, and as the rectangular shape also found in older notation, shown in the middle of the image (; ; ). Because it lasts longer than a bar in most modern time signatures, the breve is now rarely encountered except in English music, where the half-note is often used as the beat unit . However, in time signatures where the top number is exactly twice that of the bottom, such as 4/2 or 8/4, it lasts a whole bar and so may still be found. ==Breve rest== A related symbol is the double whole rest (or breve rest), which usually denotes a silence for the same duration . Double whole rests are drawn as filled-in rectangles occupying the whole vertical space between the second and third lines from the top of the musical staff. They are often used in long silent passages which are not divided into separate bars to indicate a rest of two bars . This and longer rests are collectively known as multiple rests . The names of this note and rest in different languages vary greatly: The Basque ''karratu'', Catalan ''quadrada'', Galician ''cadrada'', French ''carrée'', and Spanish ''cuadrada'' (all meaning "square") derive from the fact that the brevis was distinguished by its square stemless shape, which is true as well of one of the two modern forms (in contrast to the whole note or longer and shorter values with stems). The Basque ''laburra'' (meaning "short" or "brief") is a translation of the Latin ''brevis''. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「double whole note」の詳細全文を読む スポンサード リンク
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