On mute: Tijuana passes law banning ballads praising Mexican drug trade

Politicians have long sought to silence the genre, but previous clamp downs have only boosted its popularity

A typical song by Peso Pluma, one of Mexico's most popular singers, might start with a guitar and a trumpet, sounding like something for the older crowd - but then come the lyrics telling of drug shipments, stacks of cash and diamond-encrusted pistols.

Peso Pluma has produced some of the most notorious recent examples of narcocorridos - ballads celebrating the exploits of the Mexican underworld that are hugely popular not just at home but across Latin America and the US.