Double whole note Double whole note 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"). It is the second-longest note value still in use in modern music notation (; ). In medieval mensural notation, the "brevis" was one of the shortest note lengths in use —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" . In modern notation, a breve is commonly represented in
Musical note for this note is 440 Hz, although this varies in actual practice (see History of pitch standards). The note-naming convention specifies a letter, any accidentals, and an octave number. Each note is an integer number of half-steps away from concert A (A). Let this distance be denoted "n". If the note is above A, then "n" is positive; if it is below A, then "n" is negative. The frequency of the note ("f") (assuming equal temperament) is then: For example, one can find the frequency of C, the first C above A. There are 3 half-steps between A and C