There are recordings that are regarded as historic milestones because they represent a creative degree of the highest level that affects musical trends and generations. Within the realm of salsa, one of these masterpieces was Larry Harlow's Salsa, one of the most significant contributions to the salsa boom of the 1970s generated by Fania Records. Of the eight tracks, perhaps the most remembered is Arsenio Rodríguez's La Cartera, which Harlow recorded in a charanga format, because, as he once told me, "Tito Puente and Pupi Legaretta had both recorded La Cartera before me. They were not hits. This Arsenio composition had a spark that no one found until I decided to use...