CATEURA, Paraguay (AP) - 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. A concert they put on for The Associated Press also featured Frank Sinatra's "My Way" and some Paraguayan polkas. Rocio Riveros, 15, said it took her a year to learn how to play her flute, which was made from tin cans. "Now I can't live without this orchestra," she said. 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