Here are two videos of Peruvian children singing beautiful Gregorian chant as part of the missionary work done by the Serviteurs des Pauvres du Tiers-Monde (abbreviated "SPTM" and meaning "Servants of the Third World Poor" or "Servants of the Poor of the Third World" as it is called on the movement's English language web page). The first video shows more of the work done by the monks ("contemplatives in action"). The second shows the poverty of one of the towns where they work. This missionary movement has been supported for the past few years by the Benedictine monks of Fontgombault, who are well known for their Gregorian chant in France.
The movement's website explains that the movement was founded in 1983, was given Pope John Paul II's blessing, and is based in Cusco, Peru. Its founder was a Sicilian Augustinian named Giovanni Salerno, who was also a doctor. They have 4 houses in Cusco, one in Lima, Peru and in Hungary. Their charism is to serve Christ in the poor in that part of the world, giving them the testimony of a humble and silent service like that of Jesus Christ. In Cusco, they are working with 700 children who go to them to study, play, receive medical care and receive a Catholic catechesis. They have recently opened a free elementary school for the poorest children. They give a priority to prayer and contemplation, the liturgy of the hours, the rosary, meditation, reflection on the book "The Imitation of Christ" by Thomas à Kempis (their rule of life), frequent spiritual retreats, liturgical life with Gregorian chant in Latin, the Eucharist, the Word of God, and abandonment to the Holy Spirit and to Divine Providence.
I had not heard of this missionary work before today. Anyone who knows more about it is welcome to add information in comments.
Hat tip to le petit placide.