What I think is that this song's meaning has many different ones for many different people. Mostly, parents think that Katy Perry's songs and concerts are inappropriate (and I will admit, some are, but her personality is great) but this one isn't. Some people think it's about her being in the dark, (a part of the song) after a break up, which is reasonable, and she was on cloud nine with the person, then she fell. And she's letting go of them. Some others (this is very true, I didn't make this up) think it's about her dying. Like the part when she says "I'm letting go tonight," because when you die, you let go. Also, "I am born again, out of the lion's den," Like she's in heaven out of Earth, which is like a lion's den. (violent.) "I'm wide awake," as in she's wide awake now that she's dead. And when she says "I was in the dark," It doesn't really matter what the meaning is, because every claim isn't inappropriate, but the song is intense and is certainly meant for older children.