Would it interest you to have a soundtrack accompany the book you are reading?
A company called Booktrack raised $5 million recently, added to another $5 million raised previously, to fulfill their mission: "to connect readers with an exciting and modern way to experience an e-book with a soundtrack."
On their site they give you a few free samples. I tried the Poe poem, "The Raven." As you read, you hear the wind and when you get to the line about someone rapping on his door, you hear someone rapping on a door. Distinctly underwhelming.
I wonder who thought this idea is worth $10 million? Sorry, Booktrack, but I prefer to make up my own soundtrack in my head.