In Mexican folk music, the corrido is a story told in song. The songs are often about oppression, history, daily life for peasants, and other socially relevant topics. One form of corrido that developed during the late 19th century and lives on is the narcocorrido—ballads about drugs and contraband and their illegal trafficking. Professor James Nicolopulos of UC Berkeley traces the musical history of narcocorridos from the late 19th century to the 1970s. Drawing on recordings from the 1920s to the 1970s, Professor Nicolopulos presents musical stories of bandits, smugglers, drug traffickers, and victims on both sides of the Mexico-USA border.