The sounds of a classical guitar come from two big jelly cans. Used X-rays serve as the skins of a thumping drum set. A battered aluminum salad bowl and strings tuned with forks from what must have been an elegant table make a violin. Bottle caps work perfectly well as keys for a saxophone. A chamber orchestra of 20 children uses these and other instruments fashioned out of recycled materials from a landfill where their parents eke out livings as trash-pickers, regularly performing the music of Beethoven and Mozart, Henry Mancini and the Beatles. Word is spreading about these kids from Cateura, a vast landfill outside Paraguay's capital where some 25,000 families live alongside reeking garbage in abject poverty. The youngsters of The Orchestra of Instruments Recycled From Cateura" performed in Brazil, Panama and Colombia this year, and hope to play at an exhibit opening next year in their honor at the Musical Instrument Museum in Phoenix, Ariz. "We want to provide a way out of the landfill for these kids and their families. So we're doing the impossible so that they can travel outside Paraguay, to become renowned and admired," said Favio Chavez, a social worker and music teacher who started the orchestra. Paraguayan documentary filmmaker, Alejandra Amarilla Nash ... and film producer Juliana Penaranda-Loftus have followed the orchestra for years, joining Chavez in his social work while making their film "Landfill Harmonic" on a shoestring budget. The documentary is far from complete. But last month, the filmmakers created a Facebook page and posted a short trailer on YouTube and Vimeo that has gone viral, quickly getting more than a million views altogether.