I’ve usually heard El Cascabel performed by mariachis… but this is a choral version, sung by the Niños Cantores de Morelia and El Coro Infantil San Luis Gonzaga, two of the best known children’s choirs in the country:
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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 
Thanks for those videos. I even have a children’s song, “Gatatumba” by the Niños Catores in my music collection. We can learn so much from music, whether sung by adults or children (or even directed to these different groups..)