This story is a sequel to The Evening Sonata

Sunset and Sonata have overcome every obstacle together in their long months of love. Sonata's talent for painting has led to a huge career break, and the promise of stability and happiness for the foreseeable future. But what happens when, during this important time, the most unexpected person possible should show up to ruin everything?

Discord, Equestria's resident spirit of chaos, has appeared seemingly only to give the young lovers an ominous message coinciding with a mysterious journal entry from Twilight Sparkle. Sensing trouble, Sunset Shimmer is determined to help her friend no matter the cost. At an urging from Discord, she and Sonata have decided to return to Equestria, but find a world that neither of them recognise.

(Cover Art by Daniel Gleebits)

It has been weeks since the defeat of the Dazzlings, and Sunset Shimmer's friendships have only gotten stronger. Whilst finally relaxing in the times of peace, Sunset discovers an old enemy: Sonata Dusk. Strangely alone and apparently homeless, Sonata's luck seems to be at its all time low.
Seeing a little of herself in the former siren, Sunset embarks on a mission to help Sonata find friendship.

(For anyone who liked the old cover art, here's a side-by-side comparison of the old and new: http://daniel-gleebits.deviantart.com/art/Go-Compare-Twiddles-moustache-581352606 )

TV Tropes page: Feel free to add whatever tropes you find
http://tvtropes.org/pmwiki/pmwiki.php/Fanfic/TheEveningSonata