Top Rock Artists 2024 – A list of the best rock and metal festivals cannot be complete without Wacken Open Air. The German festival began back in 1989 and has had exponential growth that has led it to have the best heavy . As metal and rock fans count down the hours to the 2024 announcement and predict who will headline the 21st Download Festival, we look at which bands have headlined Castle Donington the most. 1 .