If you've spent much time making your way through they city's transit system, your ears have probably been mesmerized by the ethereal music of Natalia "Saw Lady" Paruz. When she's not calming straphangers with serene renditions of Ave Maria, Paruz ventures above ground to join everyone from the Israel Philharmonic Orchestra to the Little Orchestra Society. Last fall she even made her debut at Carnegie Hall as a musical saw soloist! This Saturday, Paruz will......