The Sing-Off S3 Ep.10 Opener: Mastermix Medley

Opening number for Season 3, Episode 10, Mastermix Medley: "Bitterweet Symphony/Baba O'Riley/Last Friday Night/Hollaback Girl" available on "The Sing-Off: Season 3: Episode 10 -- Mastermix Medleys and Judges' Choices" on iTunes at http://bit.ly/rsEk9w. Hosted by Nick Lachey with judges Ben Folds, Sara Bareilles and Shawn Stockman. Air date: November 21, 2011