Jack Garratt told Spotify House that he hadn’t planned to play his song “Fire.” But the way that the East Austin pop-up venue turned into a radioactive sweat pile under the record-breaking heat Tuesday afternoon, the British multi-instrumentalist truly had no choice.

The critically lauded singer, at South by Southwest on the back of new LP “Phases,” battled the sky-flames (visiting artists: stop wearing all black to Austin festivals unless you are Shawn Carter or Robert Smith) and some technical troubles to show that he’s a rare kind of genre-swirling artist. A canny understanding of Top 40 trends and a keen knack for classic sounds mean Garratt is a one-man electronic smash. A Calvin Harris who doesn’t need to rely on Florence Welches or Haims; an alloy of Sam Smith’s and Disclosure’s complimentary talents.

The cool thing about @JackGarratt is that he sounds like Hozier having a nightmare about "Trainspotting." #SXSWpic.twitter.com/sGt0BfR4Q0

— Eric Webb (@webbeditor) March 15, 2016

In short: the soulful crooner with the one-man band set-up did a lot with a little on Tuesday. An opening jazz piano riff went from zero to bass drop in under a minute. The performer whiplashed from 808-spasms to Delta guitar moans on “Weathered” quicker than you could say “I didn’t know I could sweat from there.” (“You’re the water to quench my throat” indeed, Mr. Garratt.) The aforementioned “Fire” made good use of the subwoofer budget and saw Garratt become a true drumming machine at his first SXSW show of the year. 

.@JackGarratt makes with the throwback Aphex Twin vibes at Spotify House. #SXSWpic.twitter.com/oE2O8Su0KY

— Eric Webb (@webbeditor) March 15, 2016

The set wasn’t overlong — everyone seemed on the same page about the sweltering temps. But even as wilting kept the crowd from getting too turned up, Garratt’s soulful runs and admirable precision helped smiles settle across Spotify House like a real Southern revival.