The title of this book comes from the song with the same name, where verses of it are sung at various places in The Hobbit and Lord of the Rings. Parts of it are also sung in the movie Lord of the Rings: The Fellowship of the Ring by Gandalf in the opening scene, and also as Bilbo leaves Bag End.
The second edition of The Road Goes Ever On, published in 1978, included the poem Bilbo's Last Song.
The third edition of The Road Goes Ever On, published in 1993 and likely the last, comes with additional poetry and also a CD with recordings for the entire song cycle.