Sarah Darling is one of several country stars lending her voice to the fight against cancer. She'll cover Paul McCartney's 'Blackbird,' both in concert and on a tribute album, as part of 'Let Us In Nashville,' a campaign benefiting the Women and Cancer Fund. The charity was established in memory of the legendary Beatle's late wife, Linda McCartney, who died of breast cancer in 1998.

"I'm very honored to be a part of the 'Let Us In' project, and it's always been a dream of mine to record one of my all-time favorite songs, 'Blackbird,'" Sarah tells The Boot. "I love what the song is about, and not to mention it's written by Sir Paul McCartney. I pray that this project touches many lives and continues to grow bringing awareness for women and children fighting cancer."

Listen to the world premiere of Sarah's 'Blackbird' below.

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'Blackbird' will be included on the compilation album, 'Let Us In Nashville -- A Tribute to Linda McCartney,' set to hit stores Nov. 21. Other artists covering McCartney songs on the project include Ricky Skaggs, Phil Vassar, Steel Magnolia, SHeDaisy and Chuck Wicks, among a long list of others from the country and pop worlds. See a full track list below, and pre-order the album here.

Sarah will join several of those artists at a special Let Us In show, November 7 at Nashville's Ryman Auditorium. Hosted by actor/musician Jeff Daniels, who also contributes to the album, the concert will feature each artist performing one of their own songs and one McCartney tune. Tickets are still available and can be purchased here, with all proceeds going to the Women and Cancer Fund.

'Let Us In Nashville -- A Tribute to Linda McCartney' Track List:

Blue Sky Riders (Kenny Loggins, Georgia Middleman and Gary Burr) - 'Junk'

Juliana Cole - 'Bluebird'

Jeff Daniels - 'Heart Of The Country'

Sarah Darling - 'Blackbird'

Tommy Emmanuel - 'She's a Woman'

Nikki Shannon Fernandez - 'I Saw Her Standing There'

Cheyenne Kimball - 'Mull Of Kintyre'

Samantha Landrum - 'Pipes of Peace'

Timothy B. Schmit, Mark Hudson, Laurence Juber, Denny Seiwell - 'Every Night'

Ricky Skaggs - 'Listen to What the Man Said'

SHeDAISY - 'With A Little Luck'

Jordyn Shellhart - 'I Will'

Nancy Siranni - 'Calico Skies'

Steel Magnolia - 'Maybe I'm Amazed'

Phil Vassar - 'Lady Madonna'

Chuck Wicks - 'No More Lonely Nights'