 Most notably, "The Battle of Evermore", "Misty Mountain Hop", "No Quarter", "Ramble On" and "Over the Hills and Far Away" contain verses referencing Tolkien's "The Lord of the Rings" and "The Hobbit".Conversely, Plant sometimes used more straightforward blues-based lyrics dealing primarily with sexual innuendo, as in "The Lemon Song", "Trampled Under Foot", and "Black Dog".Welsh mythology also forms a basis of Plant's interest in mystical lyrics.