The Greek word "rythmos" means a measuring period. This term is not only music. Everything in our life is subject to a certain rhythm and the onset of the seasons, and the alternation of day and night, and the beating of the heart. It is very difficult to give this concept a clear definition. No wonder Mayakovsky said about the poetic rhythm: Rhythm is the main force, the main energy of the verse. To explain it can't".
Musical rhythm is alternating and the ratio of different musical durations and accents.
Rhythm - bright expressive tool. Often it determines the nature and even the genre of music. Thanks to the rhythm we can, for example, to distinguish between March and waltz, Mazurka polka. For each of these genres is characterized by certain rhythmic figures that are repeated throughout the work.
A very important role rhythm plays in jazz music. Group percussion jazz ensemble often delights lovers of this type of musical art virtuoso rhythmic improvisations.