I have no idea where this video was taken, or what the occasion was, but it looks as if this performance by the Mariachi Juvil Oro de México was part of a religious celebration… which didn’t interfere with other worshipers following the dictates of their own conscience.
Or maybe the old lady is deaf. Either way, ¡disfrutelo!
The Mexfiles has never expected to turn a profit, but personal funds only go so far. Miscellaneous expenses (telephone, internet connection, subscriptions, spyware, hardware repair, etc.) run about 600 pesos (35 US$) a month, and donations are gratefully accepted. Please note that your donations are in Mexican Pesos (18 pesos to the US Dollar as of February 2019). A 25 US$ donation is 450 pesos.
The background of Mexican anti-clericalism and the "atheist" general who led the Catholic counter-revolution of the 1920s 128 pp., Editorial Mazatlán, 2012.
An oral history of the World War II experiences of Gilberto Bosques (1894 – 1997), Mexico 's Consul General in Marseilles, France, who saved tens of thousands from the Nazis. 36 pp. Editorial Mazatlán, 2007 $35 MXP (click the image)
mexfiles.net 
Such a great example of how Mexico is perfect because of its imperfection…¡ Asi es México Señores!
All around good blog..