The pasillo is a musical genre that originated in the 19th century Viceroyalty of New Granada in Bogotá, Colombia, influenced by the Viennese waltz and Spanish paso doble. It is associated with Colombian and Ecuadorian nationalism and was popularized by military bands and singers like Nicasio Safadi, Enriquez Ibanez Mora, and Julio Jaramillo in the early 20th century. The pasillo keeps evolving due to social, economic, and political changes but still features guitar, mandolin, and string instruments with poetic, sentimental lyrics about Ecuadorian culture and landscape.