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How many notes are there and why are they like that? Is this the only option? Is it possible to see musical harmony with your eyes? Is there an ideal sound series? How does ancient music differ from modern music at its core? The answers to these and many other questions are provided in the Algebra of Harmony series of programs. Using reasoning and illustrations, the programs explain to the viewer the basic structure of music, reveal its deep connection with mathematics and show the logic of the path from the very first ideas about musical sounds to the present day. The first episode tells about what sounds and their combinations look like, explains why some combinations seem harmonious to a person, while others do not, and describes one of the first versions of the algorithmic construction of a set of notes. XX2 century - http://22century.ru/ XX2 century on Facebook - / xx2century XX2 century on VK - https://vk.com/xx2vek