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 book: Lewis's interest in the literary symbolism of medieval and Renaissance astrology is more overtly referenced in other works such as his study of medieval cosmology "The Discarded Image", and in his early poetry as well as in "Space Trilogy". Narnia scholar Paul F. Ford finds Ward's assertion that Lewis intended "The Chronicles" to be an embodiment of medieval astrology implausible, though Ford addresses an earlier (2003) version of Ward's thesis (also called "Planet Narnia", published in the "Times Literary Supplement"). Ford argues that Lewis did not start with a coherent plan for the books, but Ward's book answers this