Never, ever turn your back on Sweden. ABBA, Robyn, Max Martin, the Hives—there is a national mandate to be catchy, no matter what genre you think you are in. Another Swede is beginning to circulate: Lykke Li. Her sound is in the same deceptively light vein as Annie, of “Chewing Gum” fame. The songs sound like trifles, and then they’re not, though they would rather you continue to think that they are. Below are two versions of “Little Bit,” a song I have not managed to shake. Though one of these clips is entirely acoustic, both feature dancing, none of it predictable.