From here: "We do not aspire to infringe copyrights, and we embolden you to purchase the artist's album and official song book."
(I'm looking for the Ballad of Serenity. We saw Serenity on Friday. It's good but not happy. I'm inclined to agree with this assessment of it, at least on first reading. Anyway, bold or not, there is no song book to be purchased.)