The highly acclaimed documentary "Landfill Harmonic" follows the story of a Paraguayan music school that teaches its students to play music using instruments made from pieces of discarded rubbish. The youth orchestra, composed of impoverished children from the neighborhood of Cateura, has gained an unlikely reputation for its talent and has opened for heavy metal group Metallica, jammed with Stevie Wonder and Megadeth and spawned copycat projects across the world.