Those who were lucky enough to catch the gig were quick to take to Twitter and Instagram to post their pictures and videos of the surprise performance, and successfully remind the rest of us what we're missing:
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#Foals #SecretSet? Yes please! #RandL2015 #ReadingFestival #Live #Music #Summer
A video posted by Dan Waggon (@dans_waggon) on
Foals were INCREDIBLE I LOVE READING FEST
— Becca (@_beccaking) August 29, 2015
Foals just played a set at reading and this is the best day of my life
— g (@gr0intwerk) August 29, 2015
Foals bring the surprise to Reading Festival pic.twitter.com/9ReGmRTVKz
— Chris Mathews (@laughmanimages) August 29, 2015
See all the best pictures from Day 1 of Reading and Leeds 2015
The band recently announced they're heading off around the UK on a club tour this winter, with stops at places including Liverpool, Aberdeen and Margate.
Last night saw Mumford & Sons perform a storming headline set at Reading, after Alt-J thrilled fans with a mix of old and new tracks.
Tonight's line-up includes performances from Royal Blood and Bring Me the Horizon as well as a headline set from Metallica.
