There are several main types of art in the world, but music, of course, occupies a leading position in this series.  It is not without reason that many great thinkers gave the palm to music: it is an amazing symbiosis of pure inspiration and strict calculation, flight of fancy and rational approach.  Music is living proof of the unity of creativity and mathematics.  From this book the reader will learn many interesting facts.  What works cannot be played without solving their riddle?  Why are there harmonic and dissonant chords?  Thanks to what are we able to distinguish a violin from a trumpet by ear?  Can a singer break glass with the power of his voice? How was modern musical notation formed and what rules does it obey?  When answering these and many other questions, one cannot do without mathematics.