Another explosive, controversial yet danceable track from Puerto Rico's Calle 13. Nudity, insults flung at the Vatican, almost nothing's off limits for Calle 13.

Nelly Ocacia and Benjamín Moldonado are both 19-year-old university students, and enjoy dancing with the Ballet Folklórico Guamanique when not studying. We caught up with them at the airport in San Juan, where they were welcoming new arrivals and seeing off departing passengers, much to the delight of travelers.