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The lineup for arguably the biggest summer music festival, England's annual Glastonbury throw down, has arrived—and, well, it's a bit perplexing. 

The Rolling Stones, Arctic Monkeys and Mumford and Sons are billed as the headliners, but according to a festival poster at Glastonbury.com, the Arctic Monkeys are in fact billed above the Rolling Stones. Wait. Say whaaaaaaaa?

It's true. But is this not illegal in England, where Mick Jagger is knighted? Even in the UK, where the Monkeys are hugely famous despite releasing only one respectable album (2007's Favourite Worst Nightmare), it seems completely illogical for the Stones to open for four lads from Sheffield. 

How. Did. This. Happen? Is Keef aware this was in his contract? Doubtful.

Anywho. Despite the serious lineup gaffe (the Monkeys have no "Beast of Burden"-stature classics in their catalog), Glastonbury also features tons of other awesome artists in the lineup, including... [deep breath]...

Portishead, Nick Cave and the Bad Seeds, Vampire Weekend, Phoenix, the xx, Smashing Pumpkins, Primal Scream, Elvis Costello, PiL, Tame Impala, Alabama Shakes, Azealia Banks, Chic ft. Nile Rodgers, Public Enemy, The Weeknd, Major Lazer, Toro Y Moi, Cat Power, The Horrors, Dinosaur Jr., Devendra Banhart, Solange, King Krule, Melody's Echo Chamber, Crystal Castles, James Blake, Johnny Marr, Jessie Ware, Tyler, the Creator, Local Natives, Savages, Nas, Disclosure, SBTRKT, Simian Mobile Disco, and many, many more. 

See the full lineup here