Christina Aguilera has unveiled another song from her forthcoming album, Liberation, her first LP since 2012's Lotus. The emotional ballad, "Twice," follows the release of her Kanye West-produced "Accelerate," which features Ty Dolla $ign and 2 Chainz. On the new, moody track, the singer contemplates the duality that can be found with love and notes that it's worth the emotional ...