Tens of thousands of people have been killed in drug-related violence in Mexico over the past seven years. Most of the violence is attributed to fighting between rival drug gangs for control of territory and drug shipment routes.
The free edition of Pandora can stream music over the Web at a bitrate of 128 Kpbs or 57.6MB per hour. This could mount up to a significant usage each month. For example, if you listed to Pandora for one hour each weekday while commuting, you would use at least 1.1GB over a month containing 20 workdays.
Let's look at streaming first. Spotify says that the average user listens to its product for 70 minutes per day. It streams at 160 kilobits per second. Per user, that means that it is streaming 160*60*70 = 672,000 kilobits per day = 84 MBytes per day. It says it has 5 million users (as of early September; probably more now).