Music can be divided into genres in many different ways. These classifications are often arbitrary and controversial, and closely related styles often overlap. Many do not believe that generic classification of musical styles is possible in any logically consistent way, and also argue that doing so sets limitations and boundaries that hinder the development of music. While no one doubts that it is possible to note similarities between musical pieces, there are often exceptions and caveats associated. Music is an art, entertainment, or other human activity which involves organized and audible sound, though definitions vary. ... A music genre is a category (or genre) of pieces of music that share a certain style or basic musical language (van der Merwe 1989, p. ...
Many genres can be subdivided into narrower, more specific subgenres.
The definition of music as sound with particular characteristics is taken as a given by psychoacoustics, and is a common one in musicology and performance.
Music is often preserved in memory and performance only, handed down orally, or aurally ("by ear"), this music often may be considered "traditional" or not considered composed by individuals.
Music history itself is the (distinct) subfield of musicology and history, which studies the history of music theory.
The actual definition of music is hotly contested, and sounds accepted as music vary according to historical era and culture, but it is usually held that the sounds must at least be consciously organized, either by an individual or a group.
Music can be performed by a single musician, or several may band together to form a musical ensemble such as a rock band or orchestra.
Deaf people can experience music by feeling the vibrations in their body; the most famous example of a deaf musician is the composer Ludwig van Beethoven, who composed many famous works even after he had completely lost his hearing.