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Since childhood, we have been accustomed to the fact that there are 7 days in a week, 7 colors in a rainbow, and 7 notes in music. It would seem to be a familiar axiom, but in reality, things are much more interesting with music. Why did humanity at some point decide that 7 is the optimal number of notes for writing music? And are there really seven notes, because if you look at the keys, you can count 12 keys in one octave, and the word octave itself seems to hint that there should be 8 notes? Let's go figure it out! Kamerton Show is a channel for music lovers, musicians and for all those who cannot imagine their life without music! Interesting facts, reviews of releases, news, historical events - everything related to the world of music! Video series: History of Music: Part 1: • History of Music. Part I Part 2: • History of Music. Part II Part 3: • History of Music. Part III Our social networks: FB - / kamertonshow Insta - / valerielaitinen VK - https://vk.com/thekamertonshow