In Quintuple Time by HoofBitingActionOverload
Link - http://www.fimfiction.net/story/109935/1/in-quintuple-time/in-quintuple-time

"Applejack steps out of her barn to discover that her home is gone, and the entirety of Sweet Apple Acres has been transformed into a beach. Meanwhile, Rainbow Dash is opening up a juice bar on her front lawn, Pinkie Pie's dancing the hula, and Big McIntosh is getting his groove on. And she soon realizes that her troubles have only just begun."

Music used - Message in a Bottle (1979) by The Police, 
                    The Safety Dance (1983) by Men Without Hats
I own nothing in this video.