In December 2014, The War on Drugs frontman Adam Granduciel stepped on to the stage at Auckland's Powerstation and began soundchecking ahead of one of their sold-out shows.
Following the breakout success of their third studio album Lost in the Dream, The War on Drugs were in the midst of an enormous world tour. As Granduciel and his band prepared to practise a few songs, Powerstation staff lent him a black Stratocaster guitar to fiddle around on - and within moments Granduciel was playing a brand new riff that came seemingly out of nowhere.
"I remember taking it out of the case, putting it on, and I'd never played that riff before, ever. I just put in on and it's the first thing I've got on my hands. We played it for like 20 minutes in soundcheck," says Granduciel.
Halfway through Sweetest Thing, the fourth song on The War on Drugs' newest album A Deeper Understanding, a crystalline guitar bursts into life with the very same riff that Granduciel sings over the phone to me - the same one that came to life at the Powerstation. The riff pulls the song into a glorious crescendo of layered guitar solos, unleashing a euphoric energy for the track's final three minutes.