The number of sounds that the human ear can hear, in an octave, is infinite. The frequency ratio 200:100, which is 2:1, represents what is called an octave. Another sound, having twice the frequency, that is, 200 Hz, will sound the same. Now, as an example, take a sound (or tone) having a frequency of 100 Hz. The frequency range of a sound the human ear can hear is 20 Hz to 20,000 Hz. The frequency is reported in a unit called Hertz (Hz). The frequency of a vibration decides the pitch of the sound it represents (how high or low the sound feels to the ear). It is a series of regular vibrations in a medium like air (as opposed to irregular vibrations, which would be heard as noise). In spite of this, Indian music has maintained it’s characteristics in it’s highly developed melodic and rhythmic structure. History of Indian music, lost in ancient pas, is so interwoven with mythology and legends, that it is surrounded by misconceptions and mystery.
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