A song is a composition for voice and it naturally performed by singing or it will be alongside musical instruments. A song can be for a solo singer or a duet, or it can be a larger ensemble involving more voices. A choral song or a vocal song may be accompanied by some musical instruments. The lyrics of songs are typical of a poetic, rhyming nature.
It can be broadly divided into many different forms and depending on the criteria used. It can be more than one voice to a part are considered choral works. One division is between art songs, pop songs, and folk songs.
Art songs are for performance in their own style or right and usually performed with accompaniment by the piano. They also have other types of accompaniment like a string quartet, an orchestra, and always notated also. Normally they have an author who is identified, and also they have composer and voice training for good performance.
Folk songs are often of anonymous origin that are transmitted orally. They are also frequently a major aspect of national or it will be a cultural identity. Art songs often approach the status of folk songs when people forget who was the author of this song. These songs are also frequently transmitted non-orally. These songs exist in every culture.
Modern songs are typically distributed as recordings and are played on the radio. We know that a popular song can become a modern folk song when a huge number of members of the public learn to sing this song from the recorded version and also teach their version to others. Songs that are popular may be called pop songs, although pop songs may instead be considered more commercially.