When FKA twigs does a cover, she doesn't just sing, she performs. The singer dropped by the BBC Radio 1 live lounge where she performed a uniquely haunting rendition of Sia's "Elastic Heart" (we didn't think it was possible, but she proved us wrong). Twigs went way beyond a typical cover and added some contemporary choreography to the mix. (Side note: In case you didn't know, Robert Pattinson's lady love is also a talented dancer.) Once the second verse kicked in, FKA twigs removed her jacket and eventually released the mic from its stand so she could really move around. With the help of a male dancer, the performance was elevated from a stripped-down cover to a beautiful work of art. But what else should we expect from the woman who gave us "Pendulum?" You can check out the entire performance below, and watch her perform her song "In Time," as well. Also on HuffPost: For a constant stream of entertainment news and discussion, follow HuffPost Entertainment on Viber.– This feed and its contents are the property of The Huffington Post, and use is subject to our terms. It may be used for personal consumption, but may not be distributed on a website.