Run by Snow Patrol has me in tears every time.
My wife had just come out of a major operation and took a bad reaction to the anaesthetic. Her oxygen levels were crashing, her heart would falter and stutter and only injections (adrenaline?) would bring her back, albeit with lower oxygen levels each time. A Priest was called but I told him to sling his hook and held onto my wife's hand, constantly talking to her and not letting her go. The lines "Light up, light up, as if you had a choice. Even if you cannot hear my voice, I'll be right beside you dear" mean so much to me.