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An '''Octave''' is an [[interval]] of eight (oct- means 8). It is used primarily in Western [[music]], because eight [[tones]] above the any [[pitch]] is another pitch that is interchangeble with it. This means the two notes sound the same although they're eight steps higher or lower.  

An '''Octave''' is an [[interval]] of eight (oct- means 8). It is used primarily in Western [[music]]. If two notes are distant one octave, the higher note has exactly a frequency twice that of the lower note. For example the ''central C'' has a frequency of about 260 Hz, the C an octave under is about 130 Hz and the C an octave higher is about 520 Hz. Thus eight [[Tone|tones]] above any [[pitch]] is another pitch that is interchangeble with it, sounds the same, even if higher, and has the same name. This means the two notes sound the same although they're eight tones higher or lower, or twelve steps counting the [[Semitone|semitones]].  

Octave can also mean a group of eight.

Octave can also mean a group of eight.

Reference: Pocket Manual of Musical Terms, edited be Theodore Baker

===Reference===

''Pocket Manual of Musical Terms'', edited be Theodore Baker

[[Category:Music]]

[[Category:Music]]