After the student body of Canterlot High is swayed by yet another surprise musical number during lunch, Sunset Shimmer muses the students are easily influenced by songs at this time. Pinkie quickly comes up with a song of her own.

Sunset Shimmer considers this a high point of her week.

As Twilight attempts to get Starlight Glimmer to see the error of her ways, Spike can't help but interject. If Starlight had a portal to take her to any place or any time, why fixate on one single event when she could accomplish so much more?

As it turns out, Starlight Glimmer has an answer. Several in fact.

Inspired by a conversation with the story's editor Tired Old Man.

This is a fic based on the Time Loop Files, the format of which was first codified by Innortal on fanfiction.net.
Here's a brief guide.
The basic idea is, one character (the Anchor, usually the main character of a fictional setting) is looping back to the very first moments of their parent series every time either they die or some kind of time limit expires. They of course end up monumentally stir crazy given enough time.
Eventually others start to loop as well.
The reset is not always perfect. Sometimes a loop's history will be different to the "prime" loop, or canonical plot.
"Crossover" or "Fusion" loops also occur, randomly. These can involve the home loopers having a guest, or the anchor for one universe spending time in another, or replacements of one character by another.
Vacation Loops are where the Anchor (or others) decide/s "buck it" and lets off steam by doing whatever comes to mind. There's little or no attempt to maintain the original timeline.

In addition, and particularly more recently, it should be known that this story has a collaborative element to it - people may submit loop ideas or loops, ideally at the Spacebattles thread (a link to the current version of which is on the Trope page), and they may become included.

There's two page image options, thanks to Filraen - the current page image has been edited by the original creator from this work of theirs.. The other one is here:
http://hourglass-vectors.deviantart.com/art/MLP-Loops-466030169

A few months after the events of Super Speedy Cider Squeezy 6000, Applejack decides to officially integrate the others into her family with an Apple tradition: a long night of cider drinking.

The next morning Applejack wakes up...in Twilight's bed...with a gold band on her hoof...and a legally binding document on the bedside table...

Cover art by ThePristineEye

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And check out About Last Night: A Deleted Scene, by EquesTRON.