Ignore the fact that i called this episode 7, other than that GREAT episode lol
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I'm back! idk if it was explained to you, but from what I've understood, the song she sings is describing HER story. Up until then she was only recounting the stories of heroes, but this song is for the common people. It's a song about not giving up no matter how crazy the day before was - the morning still comes. ie. life still goes on. So it's about not letting things that are worrying you trouble you too much and gives motivation to move on.
At least that's how I perceive it. :)