Rolling Stone has ruffled feathers with its updated 200 Greatest Singers of All Time list. The publication started the New Year with an update to its rankings, which began in 2008, honoring the best vocalists in pop music. This time around, the list excludes powerhouses like Celine Dion, Pink, Justin Bieber, Jennifer Hudson, Janet Jackson, Tony Bennett, Madonna, Nat King Cole, Dionne Warwick and more. "This new list was compiled our staff