Beat describes the regular, recurrent pulse that is subdivided and organized to create rhythms and metrical configurations.
Rhythm is an arrangement of sounds in music. In the most general sense, it is the orderly alternation of contrasting elements. The concept of rhythm can also be found in other arts. It is one of the essential elements of all music, even if certain songs contain other elements.
Rhythm can exist without melody, like drum beats in so-called primitive music, but melody cannot exist without rhythm. In music with both harmony and melody, the rhythmic structure cannot be separated. A unit division of musical time is called a beat.
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