While She Sleeps & Mastodon Confirmed for Reading & Leeds

While She Sleeps and Mastodon have been confirmed for this summer’s Reading & Leeds festivals. Head below to view the full line-up, as well as the announcement.
So @mastodonmusic headlining the other day of The Pit @OfficialRandL will be amazing right?
— Daniel P Carter (@DanielPCarter) February 22, 2015“@DanielPCarter: SO yeah. @whileshesleeps for The Pit is exciting right?” #catsoutthebag
— Reading & Leeds Fest (@OfficialRandL) February 22, 2015
