Both of the songs are bangers on their own, but thanks to a singer named Evynne Hollens, we get to hear them mashed together. Evy totally kills both tracks. Her voice is pretty spectacular, and at first we totally thought Florence was the one really singing. We totally love her title of her mix-up, too. She calls it, "Shake It Ouf."
We can't really explain the mashup's awesomeness any more. You have to watch it for yourself below. You're welcome.