I adore this recent trend (if that's the right word) of letting an orchestra play classical music on a festival. It's magical to see thousands of festival-goers going absolutely wild on Beethoven. Mosh/circlepits, crowd surfing. It's wonderful to see the orchestra and the audience having the time of their lives.
They have to keep it on easy going Beethoven like Ode to Joy here to ensure a more docile response. They cant play In the Hall of the Mountain King cause they were already burning down venues when Grieg dropped that one back in 1875, today there would be a radioactive crater.