Please answer a question about the following article about Madonna (entertainer):

Madonna's emergence occurred during the advent of MTV; Chris Nelson from The New York Times spoke of pop artists like Madonna saying, "MTV, with its almost exclusively lip-synched videos, ushered in an era in which average music fans might happily spend hours a day, every day, watching singers just mouth the words." The symbiotic relationship between the music video and lip-syncing led to a desire for the spectacle and imagery of the music video to be transferred to live stage shows. He added, "Artists like Madonna and Janet Jackson set new standards for showmanship, with concerts that included not only elaborate costumes and precision-timed pyrotechnics but also highly athletic dancing. These effects came at the expense of live singing." Thor Christensen of The Dallas Morning News commented that while Madonna earned a reputation for lip-syncing during her 1990 Blond Ambition World Tour, she has subsequently reorganized her performances by "stay[ing] mostly still during her toughest singing parts and [leaves] the dance routines to her backup troupe ... [r]ather than try to croon and dance up a storm at the same time."

Who earned a reputation of lip synching in the Blond Ambition Tour?
Madonna