The song is from season 3 episode 13 of MLP:FiM.
♫ Lyrics for the song:
Life in Equestria shimmers Life in Equestria shines And I know for absolute certain
That everything (everything) Yes, everything Yes, everything is certainly fine It's fine
Twilight Sparkle: Yes! Everything's going to be just fine!
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Life in Equestria is the seventh and final song featured in the season three finale, Magical...