Usually audio books would go in the nightly roundup, but this one has a ton of custom art to go along with it. 17 minutes worth to be exact.
And the description if you need some:
After the defeat of Tirek, Equestria is safe once more, but Luna can sense that her sister is troubled. When Celestia retreats to the starry realm of ascension in order to look upon the past, Luna joins her to discover what is bothering her.Head on down below the break to listen, or even watch thanks to the art!