Savage Silencing of Mexico's Musicians

This is a story that's been growing in the North American press. At least 12 Mexican pop singers have been murdered, in a manner that suggests drug gang hitmen are involved. This Washington Post piece suggests that drug traffickers are financing some pop careers, partly to use concerts as money-laundering opportunities. There are songs known as "narcocorridos" that celebrate drug lords. But it is not at all clear who is killing singers or why.