J Balvin is a superstar of reggaeton’s second pop crossover wave — the smooth, light variant that emerged from Colombia in the 2010s and became the anchor for contemporary Latin pop, and which set the stage for the emergence of Latin trap. So there’s heavy meaning embedded in his new single, “Reggaeton,” which is a sonic throwback to the genre’s 1990s roots. The rhythm is low and hard, the production has a handmade texture. The stars of the first crossover wave had distinctive, serrated voices, but Balvin is all light touch and near whispers — the production makes a statement more than he does. Except in the video, in which he raps in what looks like the bedroom of a Puerto Rican teenager circa 2005, with posters on the walls of Don Omar, Zion y Lennox, Luny Tunes and, of course, Daddy Yankee. CARAMANICA

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