Beyonce filled a stadium with capacity for 100k people a couple of years ago. Not sure if you'll count that or you refer specifically to rock as a genre; if it'

Beyonce filled a stadium with capacity for 100k people a couple of years ago. Not sure if you'll count that or you refer specifically to rock as a genre; if it's the second I'd say it's natural for the mainstream popularity of particular genres to rise and fall, but there still a mainstream for sure.