The Academy of Music has a lot of bad seats. Except for the main floor, the seats are a semi-circle arranged in front of a proscenium, so the seats closest to the stage have a LOT of the stage cut off. I would not sit in Sections A, B, H, or I at all. I sat in Section B once and literally about a third of the stage was out of view. People disappeared from sight for 15 minutes at a time, when I could only hear their miked voices -- it was like listening to the radio.
If you're seeing a concert, those issues aren't as important. What are you planning on seeing?
"What was the name of that cheese that I like?"
"you can't run away forever...but there's nothing wrong with getting a good head start"
"well I hope and I pray, that maybe someday, you'll walk in the room with my heart"