slayer666

got one but its hard rock xD THE NIGHT FLIGHT ORCHESTRA - Lovers In The Rain 

I would do the second half of Rocket Queen by Guns N Roses

I think the song "Heaven" would be perfect, Exit Eden redid this song + it is beautiful....8-]]

A personal wedding favourite of mine.
"A little piece of heaven - Avenged Sevenfold"

this isn't metal but still an amazing song nonetheless.
 
Moody Blues-Nights in White Satin
 
This was my parent's wedding song and it's one of my favorites... it's so beautiful and perfect. Youtube link is above.

Pentagram - Be My Queen
Iron Butterfly - In-A-Gadda-Da-Vida

Yeh I was kinda joking with 'Turbo Lover' but you never know  
Two other beautiful songs are
Arthemesia - Breeze of Grief
ColdWorld - Void
and not metal but Procol Harum - 'A Whiter Shade of Pale' which my parents got married to  

My Dying Bride - 'Like Gods of the Sun'
Anathema - 'Angelica'
HIM - 'When Love and Death Embrace'
Type O Negative - 'Love you to Death', 'Be My Druidess', 'Wolfmoon'. Anything from 'October Rust' basically. 

amazing song,tnx dude
wat else ?!!

Fire house I live my life for you  love of a time  when I look in your eyes
billy idol white wedding 

Motley Crue - Without You
Danzig - Devils Plaything
Judas Priest - Turbo Lover
 

Dark Funeral - Latex Queen
 

Type O Negative - Love You to Death

Maybe something sappy and family friendly like Queensryche's "Hand On Heart"?

Probably Nothing Else Matters by Metallica. 
If you're going for some irony, then I Cum Blood by Cannibal Corpse.