Elizabeth Banks, the host of Tuesday night's Democratic National Convention, starred in the a cappella hit Pitch Perfect and directed its sequel, and she put those skills to good use for Democratic nominee Hillary Clinton, with what Banks described as a surprise video of her and other celebrities singing Rachel Platten's "Fight Song," voices only: Platten was one of those voices, along with singers Idina Menzel, Mandy Moore, Aisha Tyler, Kristin Chenoweth, Renee Felming, and Sia, plus non-singers Rob Reiner and Jane Fonda, among others.