Be very careful if you book seats in the upper level balcony, e.g. A10x. The front row (which you might think is a cool place to sit) has a big thick metal bar right on front of your eye level and will block your entire view unless you lean over it. Take a seat one row back.
Also the seats in the upper balcony slightly to either side of the stage are less packed and still offer a nice view.
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