Music that mentions literature is very enjoyable for fans of both those arts, and for anyone who likes the thrill of spotting connections in culture. Also, songs that cite books can have more intellectual depth than the average tune. And people hearing lit-laced lyrics might read the book if they haven't before. What's not to like about that?
The dimpled miscreant was suspended from day care when, asked to sing a song for the class, the child violated a dearly-held nursery-school standard by mumbling a song, sing-songily, perhaps the only song he knows by heart, the official song of his family's favorite football squad, their (and my own) Philadelphia Eagles.