Short question: what's your opinion of songs in books? I know Tolkien did it in pretty much every book he wrote, and I've seen a couple of other authors add the lyrics of really long songs to their stories.
Personally, I don't mind it if it's done well, but after reading The Hobbit and The Lord of the Rings trilogy, it's hard to keep my attention through the entire song. Four to six lines followed by story description is my preference.
But what about you? What have you seen in print that you like? What do you prefer to read? Does it bother you, or does it excite you?