But Set the Fire to the Third Bar represented a welcome departure for Lightbody.
"It really is a love song to Martha's voice," says Lightbody.
"When the band gets together, the sum of our parts is expansive and bold and somehow unifying, especially when you hear a big crowd singing along to it. Some rock is big and dumb, I think ours is big and intelligent.""I'm just a music whore," says Wainwright.
"When they got in touch to ask if I'd sing with them, I said, 'Send me the song.' " Whereupon, says Lightbody, "We thought we'd better write it."Eyes Open, Snow Patrol's two million-selling album on which the song features, rakes over the coals of a past love affair with almost single-minded lyrical focus.
"Since they fell for each other, they've hardly been out of each other's sight.
I'm afraid the news will break many fan's hearts - Gary is a bit of a pin-up".
The Irish supergroup, who are following in the footsteps of U2, invited Lisa to play with them on their recent UK tour and Gary and Lisa grew very close.
A source close to the band said: "Gary is smitten with Lisa. They've known each other for ages but things only became serious recently.
"Then one time Loudon said to the crowd: 'I wrote this song about my daughter.' I had no idea.News of the couple’s split surfaced at the end of November after Courteney was photographed without her engagement ring.The 39-year-old Snow Patrol guitarist reportedly returned to Derry following the break-up.Watch the video: Set the Fire to the Third Bar 'I have had songs written about me before, but it's the first time anyone has ever asked me to sing on one," Martha Wainwright wryly notes about her guest appearance on Snow Patrol's icy new single of yearning desire, Set the Fire to the Third Bar.Daughter of folk legends Kate Mc Garrigle and Loudon Wainwright III, sister of baroque singer-songwriter Rufus Wainwright, Martha had a childhood that was documented in song, particularly by her largely absent father, whose I'd Rather Be Lonely is a merciless account of a year they lived together in New York, when Martha was 14.