El circo (song)
The lyrics describe two brothers, "Carlos" and "Raúl" (in reference to Carlos Salinas de Gortari, president of Mexico from 1988 and 1994, and his brother Raúl Salinas de Gortari), who form a "circus" (a drug cartel) and get rid of the other "circuses" in the country. After the brothers get wealthy, Raúl makes Carlos' money disappear (a reference to the Mexican peso crisis) and their circus ends. Raúl is jailed, while Carlos leaves the country, and the people are finally at peace, unless another circus arrives and the story repeats itself.
Carlos Salinas de Gortari
Concerns amongst the general public that the electoral process was fraudulent caused some dissension when Salinas entered office in 1988. Nevertheless, in his inaugural address in December 1988, he outlined an ambitious and important goal of "modernizing" Mexico. He contended that The modernization of Mexico is essential if we are to meet the demands of the 85 million Mexicans of today... In brief, we need to modernize politics, the economy, and society. The modernization of Mexico is, moreover, an absolute imperative. This is the only way we will be able to affirm our sovereignty in a world undergoing profound transformation. 
During his six-year term in office ("sexenio") major changes were made to the Constitution of 1917 that affected political reform; church-state relations, ending many aspects of anticlericalism restricting the Catholic Church and other religious organizations; agrarian reform, ending redistribution of land under Article 27; "indigenous peoples, human rights, economic activities of the state, [and] criminal due process."