You may recall hearing the name Rockin' 1000 before, after the organisation sorted a 1,000-strong playthrough of Foo Fighters' Learn To Fly in Cesena, Italy; this year, they went 200 up and performed an entire set of rock classics, including Nirvana's Smells Like Teen Spirit.
As you can hear above, the result is quite something, and features guitarists, bassists, drummers and singers all performing at once.
As well as Nirvana, the enormous ensemble played tracks from The Black Keys, AC/DC, The White Stripes and more - the full setlist is below…
AC/DC - It's A Long Way To The Top (If You Wanna Rock 'N' Roll)
The Beatles - Come Together
Black Keys - Gold On The Ceiling
The Clash - Police On My Back
Blur - Song 2
Steppenwolf - Born To Be Wild
Eddie Cochran - C'mon Everybody
Patti Smith - People Have The Power
The Ramones - Blitzkrieg Bop
The Verve - Bittersweet Symphony
The White Stripes - Seven Nation Army
Rock medley (Purple Haze, Foxy Lady, Kashmir, Moby Dick, Heartbreaker and more)