This story is a sequel to It Came from the Mysterious Beyond
Akin to the shorts released on Youtube (and later on DVD) before and after "Rainbow Rocks" and "The Friendship Games", the following short stories involve the characters from The Land Before Time interacting in the Equestria Girls Universe, learning from each other in the process.
Takes place in the New Timeline after "It Came from the Mysterious Beyond" and may overlap or even occur after "Friendship Games."
i did love the land before time when i was a kid, but... i'm not really sure what you have here.
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When I started watching The Land Before Time Franchise again, I began to notice how similar its mythos is to MLP:FIM, and so this is an attempt to show those similarities.
Originally the stories with the songs were much more detailed, with actions in place of the lyrics, though I could add those details again in a time-code style.