Adaptations of The Chronicles of Narnia released the series on audiobook read by Sir Michael Hordern with original music composed by Michael J. Leslie and performed by Marisa Robles, as well as releasing a version read by the actor Tom Baker. From 1998 to 2003 Focus on the Family Radio Theatre recorded all seven Chronicles of Narnia on CD. Each book had three CDs apart from "The Magician's Nephew" and "The Lion, the Witch and the Wardrobe" which both had two CDs. They were released in association with The C.S. Lewis Company, with an introduction by Douglas Gresham. They used a cast of over one hundred
The Chronicles of Narnia song "Further Up, Further In" from the album "Room to Roam" by The Waterboys is heavily influenced by "The Chronicles of Narnia", with the title coming from a passage in "The Last Battle". C. S. Lewis is acknowledged in the liner notes as an influence. A convert to Christianity in later life, Lewis had authored a number of works on Christian apologetics and other literature with Christian-based themes before writing the "Narnia" books. The character Aslan is widely accepted by literary academia as being based on Jesus Christ. Lewis did not initially plan to incorporate Christian theological concepts into his