Mexican polka. The mind boggles.
I didn't know the music, but it sounds interesting, and the article focuses on the best-known and most successful group playing it, Los Tigres del Norte. Who, since getting together in the early 1970s, have sold thirty-four million records.
What I found most fascinating was the comment that they might be the only arena act in the world without a set-list. Apparently, they have maybe three songs in mind when they arrive. People in the audience write titles on slips of paper and pass those to the front, where they are tossed onto the stage. The band collects them as they go, and the concert is over when the stage is clean.
Or the promoter throws them out, because of local curfew laws. Apparently an eight-hour set is not uncommon. And the band doesn't leave until everybody else does.
That is a work-ethic, friends.