Press Alt + J on an Apple keyboard and you get Δ, the Greek letter delta, a symbol used in maths to signify changes in the gradient of a line. And if you plotted the rise of British band alt-J on a line, that gradient would be pretty steep. ‘An Awesome Wave’ (2012) was a fairy-tale debut packed with instant classics like ‘Breezeblocks’, ‘Matilda’ and ‘Taro’. The threesome took the entire history of pop and mashed it into a collage as addictive as Sigur Rós or The xx. Despite their introverted nature, alt-J made a devastating impression. This is how HUMO described their first foray at Werchter in 2013: “How much agonising beauty, how much sickly-sweet emotion, can one person take? Alt-j were life-changing in The Barn”. And again in 2015 and 2017. The new epiphany comes in the shape of their fourth album, entitled ‘The Dream’.