A popular Mexican musician who sang the praises of drug lords was shot dead in a parking lot in the west of the country, police said late Tuesday. Ernesto Barajas, a singer with the group Enigma Norteno, which has four million monthly listeners on Spotify, was gunned down in the city of Zapopan in Jalisco state. He is among several performers of so-called "narco-corridos" — a controversial sub-genre of regional music that celebrates the exploits of infamous drug cartels — to have been killed in recent months. In May, five members of the group Fugitivo were murdered by suspected drug...