Discord has heard Celestia sigh (which is funny). He's heard her growl (which is funnier). On a good day, he can even make her shout (which is hilarious). But he's never heard her laugh. Until now.

Ever wonder who taught Sunset Shimmer to play the guitar? A simple awkward after-school encounter between her and Flash becomes a look back on their previous relationship, along with a revelation or two.

Luna regresses, and Celestia must confront her worst fear. But something seems...off.