The popularity of portable music players such as the iPod has made audiobooks more accessible to people for portable listening. This has led to a boom in the creation of free audiobooks from Librivox and similar projects that take works from the public domain and enlist volunteers to read them. Audiobooks also can be created with text to speech software, although the quality of synthesised speech may suffer by comparison to voice talent recordings. Audiobooks in the private domain are also distributed online by for-profit companies such as Media Bay, the BBC (British Broadcasting Corporation), Spoken Word, Naxos, Audioville, Bookstolistento and Audible.com, which in 2006 generated $82.2 million USD in revenue through sales of downloadable audiobooks and other spoken-word content.

Clive Staples Lewis (29 November 1898–22 November 1963), commonly referred to as C. S. Lewis, was an Irish author and scholar, of mixed Irish, English, and Welsh ancestry. An Ulsterman, he was born into a Church of Ireland family in Belfast, but he was resident in England throughout his adult life. Lewis is known for his work on medieval literature, for his Christian apologetics and for his fiction, especially the children’s series entitled The Chronicles of Narnia and his science fiction Space Trilogy. He was also a leading figure in an Oxford literary group called the Inklings.