A song's a musical composition that contains vocal parts ("lyrics") that're performed ("sung"), commonly accompanied by musical instruments (exceptions would be a cappella songs). The lyrics of songs are typically of a poetic, rhyming nature, although they may be religious verses or free prose. Songs are typically for a solo singer, though they may also be in the form of a duet, trio, or composition involving more voices. See part song. (Works with more than one voice to a part, however, are co… (More on Songs)