sentences:  In its waltz, pasillo alters the classically European dance form to accompany guitar, mandolin, and other string instruments.Invented in the 19th century, pasillo became closely associated with the Colombian War of Independence, the Ecuadorian War of Independence, and Ecuadorian nationalism.Pasillo gained popularity from the recordings of the duet "Ecuador", once performed by Enrique Ibañez Mora and Nicasio Safadi.