日本語 Japanese Ask Questions Thread 8

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英語でも日本語でもOK
日本の方からのご協力も大歓迎です

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Any J/a/panese here can explain why lyrics are so complicated? How do people even write them?
I mean, these
http://www.animelyrics.com/anime/bloodc/junketsuparadox.jis
http://www.animelyrics.com/anime/symphogearg/vitalization.jis
Have a lot of Kanji that have nothing to do with what is actually sang (like 弦の琴-調べ-　迷宮-楽園-に誘う  - what is the point of such constructs?). So people are supposed to buy CD, read lyrics booklet and only then they will see the actual Kanji (and meaning?)
Also I have no idea what the song itself actually means.
http://j-lyric.net/artist/a02e166/l019b6e.html
http://www.evesta.jp/lyric/artists/a188774/lyrics/l136926.html
Gazette is incredibly awesome but what the fuck do they sing about? Even in Engrish parts what he sings sounds nothing like "
In the bottom of the dark sea" (more like "dark dead sea").
So, anyone has any insight on lyric composition process?
I can only say that in my native language there are some performers who really have nonsense lyrics that don't mean much.