Lyric discussion by sapphireskies 

i love the last lines:

"everything under the sun is in tune but the sun is eclipsed by the moon"

i believe it means: everything is fine when there's light or happiness [sun], but that the light is covered [eclipsed] by the darkness or depression [the moon].
because the entire song leads up to those lines, he's saying that life is meaningless when you're depressed.

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