My headcannon is all ponies evolved with an inherent magical ability, unicorn earth and pegasi alike (its just that obviously unicorns have a much more focused amd stronger magical ability).
Ontop of this, singing acts like a ‘magic overdrive’ alowing ponies to do things normaly impossable for a short time.
End result, ponyvillie, despite being made mostly of earth ponies, has enough magical potential while singing to change seasons in under 24 hours… damnit now I have winter wrap up in my head.
Coincidentally, I read an MLP/Attack on Titan crossover fanfic, where Princess Celestia gave the Mane Six (and Spike) a few enchanted apple seeds, to take with them on their journey. They become full-grown, fully-fruited apple trees within a matter of seconds of being planted.
Ontop of this, singing acts like a ‘magic overdrive’ alowing ponies to do things normaly impossable for a short time.
End result, ponyvillie, despite being made mostly of earth ponies, has enough magical potential while singing to change seasons in under 24 hours… damnit now I have winter wrap up in my head.