What's the most beautifully sung anime song you've heard?

Lilium from Elfen Lied.

For some reason I really love the song Morning Grace from Princess Tutu -opening song.

It's like a lullaby, and I'm learning how to sing it (it's in Japanese which makes it harder to memorize than usual :D). The voice is so light, I consider the song to be beautiful! ^_______^

I really love this song <3 The ending song to Loveless. I fell in love with it the first time I heard it and saw the lyrics translated. So beautiful. I was going to post Simple and Clean by Utada Hikaru but a lot of people reject Kingdom Hearts as anime related so.

i have a couple
1) mosaic karera, ed for gode geass.
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2) omna magini
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3) still doll, vampire knight
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4) a song of fire and storm- tsubasa
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5) synchronicity- also tsubasa
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Aiyaa Four Thousand Years is a beautiful song. I don't care that it's APH. I love this song. The lyrics are beautiful and it's a very sweet song. I even have the last line quoted in my motto. I simply love this song.

White Destiny from Pretear. Morning Grace from Princess Tutu and Aiyaa Four Thousand Years were my two top candidates, but since they're taken, I'll go with my current favorite song. I mean, just listen to it! This song is the reason I adore Yoko Ishida(she sings it, btw)!<3333 Pretear is the only anime I've ever watched where I didn't start skipping the intro after the first few episodes.

Another anime song I really love is Brothers from FullMetal Alchemist. Vic Mignogna's English version is just so gorgeous, I can't even begin to explain it! It's even sadder if you've seen the anime and you know what Ed's been through... T~T

Brothers:
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White Destiny:

here is some of my favs link
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This was the 12th Naruto Shippuden ending! I was going to do Gravity from Wolf's Rain before I realized that even the Japanese singer sang it in english... strange. Anyway, enjoy!

Vongola Family - Mirai no Oozora E

kimi no omoi egaita yume atsumeru heaven
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koyoi eden no katasumi de
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rolling star
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tonight, tonight, tonight

this ending

La Crimosa from Kuroshituji Is the best song that I've heard..and it's my FAV!

3rd opening song from Naruto Shippuuden,Blue bird!!!!! It's so beautiful.And the 2nd opening song from Naruto Shippuuden,Distance.'Cause that song is so deep and touch,that song it's always make me remember about my friends.

fuyu no semi from winter cicada

Definitely the ending to Kuroshitsuji II. It is one of Matsushita Yuya's most heartfelt songs.
Some other good ones are:
The opening to Mayo Chiki! "Be Starters!"
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The 15th ending to Naruto "You Can Do It"
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Ikuto's character song from Shugo Chara!
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The second opening to Kuroshitsuji (the second part of Monochrome no Kiss)
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This one TT^TT