La Noche de mi Mal
Trios de Los Hons. Michel y el Mariachi Guadalajara de Silvestre Vargas
Peerless (Mexico) LPL 170
What the heck Atomic Attic... do you post whatever you find? Yup... pretty much and in this case I'm posting a sample from this vintage record found in a record store throwaway pile. Although the traditional arrangements might not hold your attention, the emotional vocal treatments certainly will.
I found this english language page featuring background on Loa Beltran if you like to read up on her.