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It was previously speculated this week that Arctic Monkeys would play the festival. The rumours came about when the promoters of the festival uploaded a promo photo to Instagram which teased the digits '0114'... which is the dialling code for Sheffield - the band's hometown of Sheffield. The digits have previously appeared on Arctic Monkeys' drummer Matt Helders' Drum Kit in the past. But the photo was then removed and replaced by a promo photo featuring the digits '14' and '+1' instead.

https://www.instagram.com/p/BeDazx6DXxO/?taken-by=madcoolfestival

We'll update you on this mystery as soon as we get it...