A song is a piece of music that contains both melody and lyrics. It is protected by copyright: the melody as a musical work, and the words as a literary work. It is possible to have a song without either the melody or the words; such pieces are often referred to as instrumental music, but it is important to remember that they are still songs.
Unlike speech, music heightens the effect of lyrics, creating passion and projection that are difficult to convey in spoken language. Singing style differs between cultures, reflecting variables such as ideals of social interaction and perceptions of the spirit world. Some societies favour a relaxed, natural vocal quality; others encourage a highly trained sound, and articulation that is precise and articulate.
Song is used in a variety of ways, both independently and within other art forms such as drama, opera, and musical theatre. It may also feature in works of dance, and in film and television. It can be improvised, as in some folk songs, or written and performed quickly, as in the case of commercial popular songs.
The sounds of wind, a dripping tap, footsteps, a baby crying, a car door slamming, a bar-room conversation, a familiar voice, a waterfall or even the roar of a crowd can be listened to as music. It may evoke emotion, change one’s mood, or transport them to another place and time. In some cases the songwriters of these sounds can be identified and given credit for their creations.