Music includes rock.
Music . For example , it can be hard to draw the line between some early 1980s hard rock and heavy metal . 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 . The music industry includes the individuals who create new songs and musical pieces ( such as songwriters and composers ) , individuals who perform music ( which include orchestra , jazz band and rock band musicians , singers and conductors ) , individuals who record music ( music producers and sound engineers ) , individuals who organize concert tours , and individuals who sell recordings and sheet music and scores to customers .