Lyric discussion by im_a_pirate 

Cover art for Half-Light lyrics by Porcupine Tree

David was the name of the guy who the album/story is based around, if you read the screenplay on www.myspace.com/deadwing. For those of you who have, you'll understand this a whole lot better.

I see this as Elizabeth (The female character) singing to David. Now I leave you to draw your own conclusions.