Lyric

From the Greek, a song sung with a lyre. Now, commonly used to mean a song of no defined length or structure. Also, a lyric poem is one that expresses a subjective, personal point of view.

 I would be the Lyric
 Ever on the lip,
 Rather than the Epic
 Memory lets slip.
   —Thomas Bailey Aldrich

The term is also commonly used to mean the words of a song.