Humans tend to focus on certain scales that include so many tones. Even in music that sounds completely different, it is found that they typically use the same type of scales. The tonal sounds of the vocalization of humans are often the most important because it is from them that we gain information. This is because it gives us information about our competitors and potential mates which could lead to being successful. Two scientists took an approach comparing scales to the frequencies in speech. They were then able to determine what scales were most popular depending on how similar they were to the frequency in human vocalization. The more similar the scale was, the more popular it was.
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