The creation, performance, significance, and even the definition of music vary according to culture and social context. Music ranges from strictly organized compositions (and their spontaneous improvisations) to improvisational music. Music can be divided into genres and subgenres, although the dividing lines and relationships between music genres are often subtle, sometimes open to debate, and occasionally based on marketing strategies.
Music has been used throughout human history in one form or another. Archaeological evidence suggests that musical traditions may date back to at least 50,000 years. Stone Age instruments such as flutes made of hollow bones and seashells have been found. Music is found in a variety of cultures around the world, and is often associated with religious rituals and ceremonies, as well as social gatherings. Music can also be used as a form of therapy and expression.
The study of music or musicology can explore the history of musical traditions, theories, and practices, and the cultural significance and impact of music. Music can also be classified according to its style or genre, its performance medium, and its purpose or context.