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An octave is the musical interval between one note and another note with double (or half) its frequency.
For example, middle C vibrates at about 262 Hz, while the C one octave higher vibrates at about 523 Hz—exactly double. The word "octave" comes from the Latin for "eight," since there are eight notes in a major scale before you reach the same note again.
Notes an octave apart have a special quality: they sound like the "same" note, just higher or lower. This is why men and women can sing the same melody together despite their different vocal ranges.
For example, middle C vibrates at about 262 Hz, while the C one octave higher vibrates at about 523 Hz—exactly double. The word "octave" comes from the Latin for "eight," since there are eight notes in a major scale before you reach the same note again.
Notes an octave apart have a special quality: they sound like the "same" note, just higher or lower. This is why men and women can sing the same melody together despite their different vocal ranges.