Pasillo (English: little step, hallway or aisle) is a Colombian genre of music extremely popular in the territories that composed the 19th century Viceroyalty of New Granada: Born in Colombia, it spread to other areas; especially Ecuador (where it is considered the national musical style) and, to a lesser extent, the mountainous regions of Venezuela and Panama. Venezuelans refer to this style of music as "vals" (Spanish for "Waltz"). In its waltz, pasillo alters the classically European dance form to accompany guitar, mandolin, and other string instruments.