Lionel Richie is widely regarded as one of the greatest singer-songwriters of the 20th century, with such hits under his belt as “You Are,” “My Love,” and of course the chart-topping smash “Hello.” ...

Though the cover was good for a standing O from Bryan and Richie, Underwood wasn't quite as sold: "He did a lot more, vocally, in previous performances," she said. Bryan helpfully pointed out ...