On an unseasonably warm night in March, 2013, within the august, hallowed walls of the Royal Albert Hall in London, something extraordinary happened. Five musicians took to the stage, launched into a song called Inhaler, and blew the roof off. For the 5,000-plus people who were lucky enough to be present that evening, the experience was more like a mass epiphany at a revivalist meeting than a gig. Foals whipped up a frenzy and sent it hurtling towards the audience, who gave it a shake and sent it hurtling right back. Two hours later, we staggered, reeling, out into the night. This was more than music. This was alchemy.