I remember the first time I heard Lila Downs on the radio, (pre Frida soundtrack) singing La Llorona and I had to stop the car because I was mesmerized by what I was hearing.  I had never had to stop the car for a song before! I was lucky enough to get to see her in concert once and it truly was a  religious experience. 

In case  you don't know her the Rolling Stone review says this:

"This Oaxaca-born, Minnesota-raised singer dips into Mexican, American and other roots traditions on her eighth album, injecting styles from brassy banda to Scottish folk into the set; she even covers Lucinda Williams' wistful "I Envy the Wind" in English and Spanish. The mélange doesn't always work, but when everything clicks, as on duets with Rubén Albarrán ("Perro Negro") and Mercedes Sosa ("Tierra de Luz"), the results are as daring as anything by Tom Waits."

 Here is her new single "Shake Away"