Activity Log aprroximate values

Hi all,

I play in a band so just for fun I searched for "guitar" and sure enough there was an activity for it. We play 3 60min sets a night and it has a value of over 500+ calories burned. That seems like a LOT. So I put down 135 min taking 15 off of each set. How can this be so much, any ideas?

That is for playing while standing i have almost 1000 cal burned if i did that at my weight.