Okayokayokay, so.
First of all, I'm really pleased with how this turned out.
Second of all, I hafta give credit where credit is due. This video was inspired by JulietLenne, who made a video for this song with Final Fantasy. Actually, she's the only reason I ever learned the name for this song. x3 So, I made a video to go with the lyrics of the song, like she did, only with Kingdom Hearts. (I hope she doesn't mind.)
Right, so Kairi's the gypsy woman, Sora's the gypsy man, Namine is the moon, Riku is her son, and Roxas is the singer / the love the moon could never have. :'D
If you don't know this song or Spanish, you probably have no idea what I'm talking about, so here are the lyrics in English (Ya, I'm too lazy to add subtitles). Mind you, they aren't SUPER accurate, and there are some mistakes... but it's mostly the meaning. xD

A fool is he who doesn't understand
a legend tells
that a gypsy woman
implored the moon
weeping, she begged till dawn
to marry a gypsy man
"you'll have your brown-skin man"
spoke the full moon from the sky
"but in retun I want the
the first child
that you have with him,"
one who sacrifices her child
in order not to be alone
is not going
to love it very much

Moon you want to be mother
and you can't find a love
who makes you a woman.
Tell me, moon of silver
what you intend to do
with a child of flesh
ahhh, ahhh
Son of the Moon

From a cinnamon-skinned father a son
was born
white like an ermine's belly
with gray eyes
instead of olive,
moon's albino son
"Damn his appearence!
This is not a gypsy man's son
and you won't get away with this"

Moon you want to be mother
and you can't find a love
who makes you a woman.
Tell me, moon of silver
what you intend to do
with a child of flesh
ahhh, ahhh
Son of the Moon

the gypsy believing himself dishonored
went to his wife, knife in hand
"Whose son in this?
I am sure yu have decieved me!"
and he stabbed her to death
then he went to the mountain
with the child in his arms
and abandoned it there

Moon you want to be mother
and you can't find a love
who makes you a woman.
Tell me, moon of silver
what you intend to do
with a child of flesh
ahhh, ahhh
Son of the Moon

And on nights when the moon is full
it's because the child is happy
and if the child cries
the moon will wane
to make him a cradle
and if the child cries
the moon will wane to make him a cradle

Song: Hijo De La Luna, by Mecano. (less info)