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Astronomers have discovered the longest-running symphony in a cluster of galaxies more than 250 million light-years from Earth. Results from NASA's Chandra X-ray Observatory announced yesterday indicate sound waves are emanating from a supermassive black hole located at the center of the Perseus Cluster. It is impossible to hear the black hole's song, however, because its pitch is more than a million, billion times lower than the limit of human hearing
http://www.sciam.com/article.cfm?chanID=sa003&articleID=0009748F-3954-1F5E-905980A84189EEDF