I met Liván, Takeshi and the rest of their band of frikis—rock and metal fans of the punk-and-anarchist subcategory—around nine one Thursday night on the median of Havana's G Street. I'd come to Havana to write a book about what it was like to be a young adult in the post-Fidel city and, since G Street was the biggest party in town, it was where I began.