There are a few companies doing audio dramas. The largest company I know of is Big Finish, which does completely new stories in existing settings in co-ordinati

There are a few companies doing audio dramas. The largest company I know of is Big Finish, which does completely new stories in existing settings in co-ordination with rights holders. They have a large number of Doctor Who stories, and at least a few Pathfinder RPG stories. The production quality is very high, including sound effects and hiring some of the Doctor Who actors to voice their characters in the audio drama, but the prices are also quite high for the length of content. Podcasts like Welcome to Night Vale (which has book adaptations) also come to mind. There are also a few audio books where the audio book is clearly superior to the book. The audiobook version of Brandi Carlile's memoir contains almost 2 hours of music in addition to the entire text of the printed book. That said, there's also value in making texts accessible to an audience that has difficulty reading. I love watching recorded plays that I'll never get the chance to see in person. Granted, the reasons plays are inaccessible (limited venues and times) are quite different from the reasons books are inaccessible (dyslexia and sight issues, for example), but it's still great to be able to share cultural works with people who have different accessibility requirements.