"Mothers of the Disappeared" is a song by Irish rock band U2. It is the eleventh and final track on their 1987 album The Joshua Tree. The song was inspired by lead singer Bono's experiences in Nicaragua and El Salvador in July 1986, following U2's participation in the Conspiracy of Hope tour of benefit concerts for Amnesty International. He learned of the Madres de Plaza de Mayo, a group of women whose children had "forcibly disappeared" at the hands of the Argentine and Chilean dictatorships. While in Central America, he met members of COMADRES, a similar organization whose children had been abducted by the government in El Salvador. Bono sympathized with the Madres and COMADRES and wanted to pay tribute to their cause.

The song was written on a Spanish guitar, and the melody lifted from a piece Bono composed in Ethiopia in 1985 to help teach children basic forms of hygiene. The lyrics contain an implicit criticism of the Reagan Administration, which backed two South American regimes that seized power during coup d'états and which provided financial support for the military regime in El Salvador. Thematically it has been interpreted as an examination of failures and contradictions in US foreign policy. The drum beat provided by Larry Mullen Jr. was processed through an effects unit that gave it a drone-like quality, which bassist Adam Clayton described as "evocative of that sinister death squad darkness".

...
Wikipedia