Audio has been around since, I suppose, the spoken language. The difference now is distribution and availability. Audiobooks, podcasts, smart phones, voice controlled home speaker systems, connected cars, and who knows what will come next.
You have audio. You probably have a book cover. You're all set. Using an online (and mostly free) tool called Headliner, you can easily...
In a nutshell, the answer to Why Now? is because we can. Sure, microphones and book narrators have been around a long time. But...
Just use the little plus sign. It'll all be OK. You can watch the video version of me in the forest (so exciting, I...