应该是《Amazing Grace》
这歌有很多个版本，许多知名歌手都演绎过，不知你听到的是哪个版本的。
百度MP3有下：
http://mp3.baidu.com/m?f=ms&tn=baidump3&ct=134217728&lf=&rn=&word=amazing+grace&lm=-1amazing grace
amazing grace, how sweet the sound
that saved a wretch like me.
i once was lost but now i'm found,
was blind but now i see.
t'was grace that taught my heart to fear
and grace my fear relieved
how precious did that grace appear,
the hour i first believed.
through many dangers, toils and snares
we have already come
t'was grace that brought us safe thus far
and grace will lead us home.
when we've been there ten thousand years
bright shining as the sun;
we've no less days to sing god's praise
than when we first begun