A music genre is a conventional category that identifies some pieces of music as belonging to a shared tradition or set of conventions. It is to be distinguished from musical form and musical style, although in practice these terms are sometimes used interchangeably.
There are different kinds of music genres:
Rock, also called rock and roll, rock & roll, or rock ’n’ roll, form of popular music that emerged in the 1950s.
It is certainly arguable that by the end of the 20th century rock was the world’s dominant form of popular music. Originating in the United States in the 1950s, it spread to other English-speaking countries and across Europe in the ’60s, and by the ’90s its impact was obvious globally (if in many different local guises). Rock’s commercial importance was by then reflected in the organization of the multinational recording industry, in the sales racks of international record retailers, and in the playlist policies of music radio and television. If other kinds of music—classical, jazz, easy listening, country, folk, etc.—are marketed as minority interests, rock defines the musical mainstream. And so over the last half of the 20th century it became the most inclusive of musical labels—everything can be “rocked”—and in consequence the hardest to define. To answer the question, What is rock?, one first has to understand where it came from and what made it possible. And to understand rock’s cultural significance, one has to understand how it works socially as well as musically.
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Jazz, musical form, often improvisational, developed by African Americans and influenced by both European harmonic structure and African rhythms. It was developed partially from ragtime and blues and is often characterized by syncopated rhythms, polyphonic ensemble playing, varying degrees of improvisation, often deliberate deviations of pitch, and the use of original timbres.
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Ejan's Music Blog 