Think of it this way..
In real life, people sing songs or humorous poems constantly. Not as much nowadays as long ago. People sing national anthems, funny children's songs, story songs, ballads, their favorite lyric, depending on their mood. In LotR, Aragorn couldn't spontaneously start singing "Row, Row, Row your boat" at his coronation. Tolkein had to create all the popular verse that people knew, for mistrels and anyone else.
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"What mortal feels not awe/Nor trembles at our name,
Hearing our fate-appointed power sublime/Fixed by the eternal law.
For old our office, and our fame,"
-Aeschylus, Song of the Furies
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