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If you've ever cringed at the sound of someone warbling off-key on karaoke night, you may assume they're just bad singers. But that person may also suffer from a condition called amusia. People with amusia have difficulty distinguishing between two notes that are close together, or even remembering a simple melody. Today we're joined by Lauren Stewart, a research fellow at University College in London and the University of Newcastle, and who recently wrote an article about amusia in the BBC Music Magazine. Also: Touring with her latest recording Back to Me and appearing tonight at Webster Hall, rising star singer-songwriter Kathleen Edwards stops in for a chat. Following the release of her debut album "Failer" in 2003, Rolling Stone declared this Canadian native one of the year's most promising new acts.