Tegan and Sara have posted a new song titled "Shudder to Think." The track is from the soundtrack to Dallas Buyers Club, a forthcoming film with Matthew McConaughey, Jennifer Garner, and Jared Leto.

Every soundtrack sold will donate 10% of net proceeds to help finance the critical work of The Global Fund to fight AIDS in Africa. Global Fund grants supported by (RED) enable programs which include prevention, treatment, counseling, HIV testing and care services. Other participants on the album include: My Morning Jacket, Manchester Orchestra, Neon Trees, Fitz and[the Tantrums, Portugal. The Man, Cold War Kids, Capital Cities, AWOLNATION, The Naked and the Famous, The Airborne Toxic Event and Blondefire.

Find the song here.