Lyric discussion by maracastillo 

I think the song is about missing childhood and looking back at your past. One of my favorite songs of all time. It has nearly 300 plays on my iTunes, but only now did I think of this:

Picture yourself being pushed on a swing or someone picking you up and spinning you around when you were little. And once you were put back down, you would immediately say, "Again! Again!"

When he sings "again again again again", it reminds me of that.

Beautiful.

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