Music is a medium of sound in which technology has given rise to instruments, broadcast, mass consumption, and self production.
Music is performed with a vast range of instruments and vocal techniques ranging from singing to rapping; there are solely instrumental pieces, solely vocal pieces (such as songs without instrumental accompaniment), and pieces that combine singing and instruments. The word derives from Greek μουσική (mousike; "art of the Muses").
In its most general form, the activities describing music as an art form or cultural activity include the creation of works of music (songs, tunes, symphonies, and so on), the criticism of music, the study of the history of music, and the aesthetic examination of music. 20th-century composer John Cage thought that any sound can be music, saying, for example, "There is no noise, only sound."
The creation, performance, significance, and even the definition of music vary according to culture and social context. There are many types of music, including popular music, traditional music, artificially created music, art music, and music written for religious ceremonies. Music can be divided into genres (e.g., country music) and genres can be further divided into subgenres (e.g., country blues and pop country are two of the many country subgenres), although the dividing lines and relationships between music genres are often subtle, sometimes open to personal interpretation, and occasionally controversial. For example, it can be hard to draw the line between some early 1980s hard rock and heavy metal. Within the arts, music may be classified as a performing art, a fine art, or as an auditory art. Music may be played or sung and heard live at a rock concert or orchestra performance, heard live as part of a dramatic work (a music theater show or opera), or it may be recorded and listened to on a radio, MP3 player, CD player, smartphone or as film score or TV show.