It’s hard to tell what is most surprising about this song: that it manages to stick in your head despite inconsistent percussion, or that the singer is merely 16. A New Zealand sensation, Lorde brings sweeping vocals and unforgettable rhythms together in her first EP, “The Love Club.” With nearly every featured song a hit, “Tennis Court” is accompanied by the more well known “Royals,” an equally fascinating vocal track. Lorde is reminiscent of female vocalists Florence Welch and Oh Land, leading one oblivious to the fact that this accomplished songwriter is only in high school herself.