Octave

The interval spanning eight diatonic scale degrees

About Octave

An octave is the distance between one pitchPitchThe perceived highness or lowness of a sound, determined by its frequency.View full entry → and the next pitch bearing the same letter name, either higher or lower. The frequencyFrequencyThe number of sound-wave vibrations per second, measured in hertz, that determines how high or low…View full entry → ratio is exactly 2:1, making it the most consonant intervalIntervalThe distance in pitch between two notes.View full entry → after the unisonUnisonTwo or more voices or instruments sounding the same pitch simultaneously or playing the same melody.View full entry →.