Prime members can download the Audible app for iOS, Android and Windows 10 to access Channels, which will include ad-free programming and content from The Wall Street Journal, The New York Times, Charlie Rose, Harvard Business Review and The Onion, among others. It'll also include 20 curated playlists around comedy, meditation and news, as well as a rotating selection of more than 50 audiobooks.

In addition to free two-day shipping and now, free Audible content, a Prime subscription also gets you free access to Amazon's video streaming service, a ton of ebooks, photo storage, early entry to certain deals and a somewhat limited selection of music. But the company could be boosting its library of songs, and that, together with the Audible offering, could really enhance the amount and quality of its content.