[Echo-chan713]

Let's go to dictionary.com to answer that question:

1.
a short metrical composition intended or adapted for singing, especially one in rhymed stanzas; a lyric; a ballad.

2.
a musical piece adapted for singing or simulating a piece to be sung: Mendelssohn's “Songs without Words.”

3.
poetical composition; poetry.


4.
the art or act of singing; vocal music.

5.
something that is sung.

6.
an elaborate vocal signal produced by an animal, as the distinctive sounds produced by certain birds, frogs, etc., in a courtship or territorial display.