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I created 2 wireframe concepts for the book detail screen and for the playback screen.
Although most book apps seem to use a side-by-side layout for the book cover and book details, I chose an infrequently used, center-aligned option and made it more like the iOS podcast app or iTunes. Even then, I reduced the size of the book cover image in order to increase the size of the controls. My goal was to emphasize the playback controls and de-emphasize the book cover art.
These wireframes were completed in OmniGraffle.