In a span just shy of two decades, they gave away more than $1.3 billion to charity — money spent on expansions at the Curtis Institute of Music and Philadelphia Museum of Art, to substantially fund the creation of the Museum of the American Revolution, for college scholarships to students in rural Pennsylvania, to fund hospitals, literacy programs, and nature preserves, and on and on. Wednesday’s three-hour-plus tribute offered seemingly no end of testimony to their generosity, a montage of institutions transformed and individual lives changed.