For anyone following this thread: you might be interested in checking the following project out.
It is Dante's Divine Comedy, in three audio eBooks, one for each part of the poem: Hell, Purgatory and Heaven. Each eBook contains both the verses and the audio tracks, read by Prof. Lino Pertile (Harvard University), plus the SMIL files that allow Media Overlays, that is, text-audio sync.
You can download the EPUB 3 files, without DRM, for free here (the page is in English):
where you can also see a screengrab and some screenshots.
Some statistics: 14233 verses, 14333 SMIL fragments, 13h of audio, 300+ MB.