http://www.mariachi.org has a number of fine links to many Mexican music sites.
Vincente Fernandez, Juan Gabriel, Lola Beltran and Lydia Mendoza are among the names
that pop up frequently while searching the net for "musica ranchera". Also check out
http://www.elmariachi.com for some further exploration.
I would agree that Arhoolie (http://www.arhoolie.com) has the finest selection of
Mexican music for non-Mexicans, particularly when it comes to historic recordings.
Their budget priced CD series has a particularly good compilation of Mexican music
that's well worth picking up.
