Song of the goblins, what is purpose of songs in the hobbit

To provide possibly past events in the songs or to give information to the people watching or help to pass the time and make it a little fun and not so depressing when times are ruff.  Kinda hard to explain it's more so of what your view of the songs and the scenario of which the song starts.

B. Gene for production of fur.  D. Gene for production of nails.  E.  Gene for temperature regulation.

Explanation:

Just did assignment on E. 2020.