(Reuters) – Madonna was named the biggest money maker in music in 2012 on Friday, with a world tour helping her take home up to $34.6 million and highlighting the earning power of live performances as the industry increasingly goes digital. The 54-year-old Material Girl topped Billboard Magazine's annual list of 40 top money makers for the second time after earning an estimated $32 million – 93.5 percent of her revenue – from her 88-date "MDNA" tour, 2012's biggest tour. …
