Beyonce covering "Sex on Fire" at Glastonbury, 2011

A good cover, at its core, takes the source material and turns it up to 11. In this case, Beyonce took a perfectly serviceable indie rock song about sex and cranked it all the way up into a lusty power ballad sung over heavy reverb while writhing around on the floor.

also, she was pregnant at the time. What can't she do?