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== Octave equivalence == | == Octave equivalence == | ||
The octave is usually called the '''interval of equivalence''', because tones separated by this interval are perceived as having the same "pitch class" despite their different absolute pitches. This equivalence is so strong that in most musical notation systems, notes separated by octaves share the same name. For the same reason, most [[ | The octave is usually called the '''interval of equivalence''', because tones separated by this interval are perceived as having the same "pitch class" despite their different absolute pitches. This equivalence is so strong that in most musical notation systems, notes separated by octaves share the same name. For the same reason, most [[scale]]s repeat at the octave. | ||
The perception of octave equivalence appears to have both biological and cultural components. | The perception of octave equivalence appears to have both biological and cultural components. | ||