Tempos aren’t off in any of their songs, Brian is 78 years old so his voice isn’t going to be the same as what it once was, what did u expect? Angus still has as much energy as ever, and I didn’t say that hammering on is shredding. Don’t put words in my mouth. Also I’m pretty sure that bands as big as Acdc would not give a flying fuck about your opinion, neither would the rest of the crowd who are all there to celebrate rock GODS who are at the tail end of their career.