Music is a wonderful combination of sound waves that are at different frequencies that are pleasing to hear.

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Music that sounds good to the ear actually have a very specific mathematical relationship. Two waves an octave apart have a 2:1 frequency ratio. Two notes that are a fifth apart have a frequency ratio of 3:2 (for every three waves of the first there are two waves of the second), and are also popular in music. These are called intervals.

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