The indie angst of past "Twilight" scores has given way to doo-wop sadness on [article id="1671217"]"It Will Rain,"[/article] the lead single Bruno Mars dropped Tuesday (September 27). The full [article id="1671514"]"Twilight Saga: Breaking Dawn - Part 1" soundtrack[/article] will hit the streets November 8.

In a previous interview, Mars promised [article id="1671268"]"It Will Rain"[/article] would be "dark," and he didn't lie.

target="_blank">The track -- co-written and co-produced by Mars' team, the Smeezingtons -- is signature Mars: Sweeping and romantic, it focuses on the power of true love and the emotional pain of heartbreak. The pain of the track is reminiscent of his smash "Grenade."

" 'Cause there'll be no more sunlight, if I lose you, baby," he sings on the emotional chorus. "There'll be no clear skies, if I lose you, baby/ Just let the clouds, my eyes will do the same if you walk away/ Every day, it will rain."

"The Twilight Saga: Breaking Dawn - Part 1" opens in theaters November 18. "After seeing the movie, I thought that it would be a perfect fit," Mars said of the song. "The 'Twilight' movies for me [are] a love story. But it's a dark love story," he added. "And I think the best way to describe the song is: It's the darker side of love. I think that pretty much sums it up."

On Monday, a full track list dropped, revealing which other artists made the final cut for the November release. Christina Perri, Theophilus London and Aqualung & Lucy Schwartz are a few of the artists who will be featured. The track list also reveals that Iron & Wine's song "Flightless Bird, American Mouth (Wedding Version)" will be played during the long-awaited wedding.

The full track list for "The Twilight Saga: Breaking Dawn - Part 1" soundtrack:

» The Joy Formidable, "Endtapes"

» Angus & Julia Stone, "Love Will Take You"

» Bruno Mars, "It Will Rain"

» Sleeping at Last, "Turning Page"

» The Features, "From Now On"

» Christina Perri, "A Thousand Years"

» Theophilus London, "Neighbors"

» The Belle Brigade, "I Didn't Mean It"

» Noisettes, "Sister Rosetta (2011 Version)"

» Cider Sky, "Northern Lights"

» Iron & Wine, "Flightless Bird, American Mouth (Wedding Version)"

» Imperial Mammoth, "Requiem on Water"

» Aqualung & Lucy Schwartz, "Cold"

» Mia Maestro, "Llovera"

» Carter Burwell, "Love Death Rebirth"

Check out everything we've got on "The Twilight Saga: Breaking Dawn - Part 1."

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