Organ grinders have been a fixture on the streets of Mexico City since the 1800s, a result of dictator President Porfirio Díaz's passion for all things European. But nowadays, they're considered a nuisance — an assault against the ears. This, coupled with the high cost of renting and maintaining an instrument, means the tradition is at risk. Whitney Eulich talked to the remaining organilleros for @csmonitor. [story may be paywalled]