We are all familiar with the concept of an octave—whether in music or when someone raises their voice. The octave is arguably the most fundamental and essential concept in music theory. However, there is a traditional music form that completely lacks the concept of an octave: Gamelan from Indonesia. Its pitch system operates on entirely different principles than what we are used to. When we start learning music, one of the first things we learn is the octave; a 'Do' an octave higher is still 'Do'. If it weren't, it would be considered 'wrong.' Yet, in Gamelan, when a note is shifted up an octave, it is no longer the same note. Why is this? Consider the instruments we typically use: violins, pianos, and wind instruments. They share a common trait: their overtones are integer multiples of the fundamental frequency. Therefore, the octave is simply the second harmonic of the instrument. But Gamelan music is composed entirely of metal bars and gongs—percussion instruments with no strings or wind components. Because of their physical properties, percussion instruments produce non-integer overtones that interfere with themselves like water ripples. This means that if you double the frequency of a natural percussion sound, the resulting pitch will naturally drift away from the original note. Consequently, the concept of an octave is physically inapplicable to these instruments. While many modern percussion instruments are tuned to fit the western scale, true, natural percussion does not inherently have octaves. For the indigenous people of Indonesia, the octave simply doesn't exist; they haven't encountered it since birth. The concept of the octave is a product of the specific sound structures we are accustomed to; once you change the material of the instrument, the concept may disappear entirely. What we perceive as the most 'obvious' octave is perhaps just a reflection of our own habits. To the Indonesian ear, that octave might mean nothing at all.
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