Into the Labyrinth (Dead Can Dance album) and Gerrard played all instruments, without guest musicians. The lyrics are in English on tracks 2–4, 8, and 11. Gerrard sings in a self-created wordless vocal technique similar to glossolalia on tracks 1, 5–7, 9–10. Tracks 3 and 10 were performed a cappella. In the UK, the CD album was simultaneously released along a limited edition double vinyl LP (featuring "Bird" and "Spirit", the two 1991 bonus tracks from "A Passage in Time"). The title alludes to the classic legend of Greek mythology about Theseus going into the Labyrinth against the Minotaur. While not necessarily a concept album, this link
The Battle of the Labyrinth book opens with Percy Jackson attending freshman orientation at Goode High School, where he sees Rachel Elizabeth Dare, a clear-sighted mortal who helps him fight two empousai and escape. Percy travels to Camp Half-Blood, where he learns Grover is in trouble with the Council of Cloven Elders for not having found Pan. During a competition organized by the new sword instructor Quintus, Annabeth and Percy accidentally find an entrance into the Labyrinth, which presents a possible invasion route for Luke. Annabeth is given leadership of a quest to find Daedalus and convince the inventor not to give Luke Ariadne's string.