Taylor Swift played the 2016 USGP as the only stop in her 2016 tour to a crowd of 80-100k: DSC00781_DxO by RogerL2013, on Flickr DSC00862_DxO by RogerL2013, on Flickr DSC00821_DxO by RogerL2013, on Flickr DSC00842_DxO by RogerL2013, on Flickr
Wow. Not bad is an understatement. Pics aren't too bad either. Super-crisp concert footage and a good vantage point to the stage.
Did you check out the EXIF? Should also note: 100% handheld, usually with one hand (one hand was steading a camp chair that daughter and friend were standing on to see PAST the adults in front of us) Anyway, this is my daughter's favorite DSC00839_DxO by RogerL2013, on Flickr
I did notice the long lens...I didn't know you were performing acrobatics to get clear of other people. I just thought somehow you had a nice rise, or an aisle in front of you, that gave you a nice clear shot to the stage, so the long lens could get a nice clear view without heads, poles, etc in the way. Sounds like you had to work a bit to get the clear view!