it's all about the BLURBS

Audio Blurbs are short audio samples or mini-performances — typically 15 to 90 seconds — used to promote a paperback book, audiobook, or to showcase a special chapter in your book to keep your readers and listeners hooked. Think of them as the audio version of a movie trailer or a book teaser. 

And, most importantly.....think of how the audio will create a feeling of your story to your readers.