When Princess Celestia visited Sunset Shimmer, her former student was now feeling so horrible about her past and begged for Celestia’s forgiveness and tried to apologise for her spoiled and bad behaviour. Celestia told her that she was so proud of Sunset’s reformed self and for having that chance to start over.
 
Celestia wanted to give her a most precious gift, a choice. That she can return to Equestria with her, or she could stay behind and create more of the magic of friendship, but now Sunset had a better idea. Which is having both the human world and Equestria combined together with Canterlot High School and Crystal Prep now in Equestria and all of the ponies, the humans, including all of the pony and human counterparts living together in perfect harmony.
 
Sunset Shimmer: Now we can all be together.
 
“Time for a Musical Number”
 
[Spike:] I hear the music playing  
It’s swinging and it’s swaying  
A little rhapsody  
Today we’re so delighted  
Today we’re all united  
Both human and pony
 
I see pegasai flying  
Even the dolphins diving  
We’re trotting fancy-free  
We’re feeling better now  
We sing together now  
Both human and Pony
 
La dee da, we got the beat  
Move your hooves and move your feet  
Life is sweet, life is grand  
Blowing flowers with the bass brass brand
 
[Princess Twilight:] There’s no more stormy weather
 
[Sunset Shimmer:] Now we can sing together
 
[Sunset and Twilight:] In perfect harmony  
We’re feeling better now  
We sing together now  
Both human and pony
 
[Spike:] Those humans sing  
Those ponies sing  
Life is sweet as sweet can be  
Both human and pony
 
[All:] We’re feeling better now  
We sing together now  
Both human and pony
 
That song is an inspiration from “Here on the Land and Sea”