Mere Christianity, in its published form, is 60 years old this year. But the book was based on BBC radio talks given 8 years earlier during World War II.
Here’s the only recording that remains from the BBC broadcasts. It was recorded on March 21st, 1944 and aired on the BBC on April 4th of the same year. Lewis makes some interesting observations on originality, literature, and art 13 minutes in, if you’re of the patient sort: