Of all the flash mobs

Of all the flash mobs that happen, it seems to me that the one that should happen again and again, year after year is either people performing Handel's Messiah, year after year, at different locations, like this: or they should do Beethoven's "Ode to Joy" from his 9th Symphony--or both. People could do these forever, year after year, and no one would get tired of them, unlike everything else that's done. Just a thought. A hopeful thought.