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

Lilium from Elfen Lied.

For some reason I really 愛 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 愛 this song <3 The ending song to Loveless. I fell in 愛 with it the first time I heard it and saw the lyrics translated. So beautiful. I was going to post Simple and Clean によって Utada Hikaru but a lot of people reject Kingdom Hearts as アニメ related so.

i have a couple
1) モザイク 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 火災, 火 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 愛 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 愛 this song.

White Destiny from Pretear. Morning Grace from Princess Tutu and Aiyaa Four Thousand Years were my two 上, ページのトップへ candidates, but since they're taken, I'll go with my current お気に入り 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 アニメ I've ever watched where I didn't start skipping the intro after the first few episodes.

Another アニメ song I really 愛 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 アニメ and あなた 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 -ナルト- 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 -ナルト- Shippuuden,Blue bird!!!!! It's so beautiful.And the 2nd opening song from NARUTO -ナルト- 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 黒執事 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 -ナルト- "You Can Do It"
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Ikuto's character song from Shugo Chara!
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The 秒 opening to 黒執事 (the 秒 part of Monochrome no Kiss)
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This one TT^TT