Japanese Anime songs

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"Sometimes I see pieces of people who had lost their dreams, piling up like a moutain.
Sometimes, I see pieces of people who are desparately looking for God or Buddha, piling up like a mountain."

- by Captain Straydrum

This song is used in Japanese Anime "Naruto".
When did Japanese Anime songs become philosophical?
Nevertherless, songs that are played in "Naruto" are very much worth listening.
I might explore more Anime songs to deepen my thoughts.