For example, the C major scale is typically written C D E F G A B C (shown below), the initial and final C's being an octave apart.Īudio playback is not supported in your browser. Most musical scales are written so that they begin and end on notes that are an octave apart. Further octaves of a note occur at 2 n Music theory The ratio of frequencies of two notes an octave apart is therefore 2:1. The octave above or below an indicated note is sometimes abbreviated 8 a or 8 va ( Italian: all'ottava), 8 va bassa ( Italian: all'ottava bassa, sometimes also 8 vb), or simply 8 for the octave in the direction indicated by placing this mark above or below the staff.įor example, if one note has a frequency of 440 Hz, the note one octave above is at 880 Hz, and the note one octave below is at 220 Hz. Other interval qualities are also possible, though rare. To emphasize that it is one of the perfect intervals (including unison, perfect fourth, and perfect fifth), the octave is designated P8. In Western music notation, notes separated by an octave (or multiple octaves) have the same letter name and are of the same pitch class. The octave relationship is a natural phenomenon that has been referred to as the "basic miracle of music," the use of which is "common in most musical systems." The interval between the first and second harmonics of the harmonic series is an octave.
In music, an octave ( Latin: octavus: eighth) or perfect octave (sometimes called the diapason) is the interval between one musical pitch and another with double its frequency.
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