Bryan O’Mara tosses pianos out of his moving truck at the garbage dump in South Hampton, Pennsylvania on July 24, 2012. The O’Mara family has owned a piano moving business since 1874. (Jessica Kourkounis for The New York Times) 30129158A NYTCREDIT: Jessica Kourkounis for The New York TimesFor More Pianos, Last Note is Thud in the Dump

A century after the peak of American piano manufacturing, the dump is increasingly becoming the destination for instruments that are unwanted…