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But preparing to tour is a much more challenging prospect, as they try to get fit enough to do the old dance routines.
And Brian is having a mental struggle that's affecting both his voice and his physicality.
It's packed with terrific material that fans will love, and it explores some darker sides of the bandmates' lives, but it skims over any difficult aspects of their experience together.
Still, they are energetic and ready for the challenge of taking the world by storm all over again.