Forget about the "hair of the dog." Florence Welch has a way better cure for your hangover in this track she wrote while looking for a remedy for the night before. As she said when the song premiered last year, "I wanted to just shake something out, shake out these regrets, shake out these things that haunt you. It was one of those songs that came in about half an hour and when you've got a hangover, it is almost like a hangover cure." It's also been a major step forward for her career. "Florence Welch continues her superhero morph from arty rocker to pop diva with this mighty single," Rolling Stone wrote of "Shake It Out."