After “brat summer’s” sunset for the season, Charli XCX and Troye Sivan rocked Boston Sept. 28 with a two-hour, pulsating and raucous performance that couldn’t have been a more accurate encapsulation of their joint tour’s branding.

One could almost smell it from the name. The “Sweat Tour,” an international circuit of shows with  two headlining veterans of the pop music industry, stopped at TD Garden for a Saturday night rave that sent shockwaves through the historic venue.

Charli XCX has been deep in the music industry for over a decade. Up until the release of her sixth and newest studio album “brat,” her career, a pipe dream for many aspiring artists, never truly achieved the heights longtime fans would say she’s capable of. That all changed at the turn of the season earlier this year.

After “brat,” a fast-paced club-pop album with short tracks and dominating sounds released June 7, “brat summer” swept through the nation in a neon-green tidal wave. From presidential candidate and current Vice President Kamala Harris adopting the branding to viral TikTok dances, specifically the “Apple dance,” Charli XCX has surged into the zeitgeist in ways her “angels” never would have imagined possible.

Sivan’s career has had different ebbs and flows. Pop star Dua Lipa performed as an opening act for his 2016 “Suburbia” tour. No slight to the Australian phenom, but that’s hard to imagine, given Lipa’s rise to superstardom.

Charli XCX and Sivan’s friendship is a running constant in their corner of the music industry — one dominated by abrasive beats, earworm hooks and consistent subversions of the pop genre. Such innovation would not have been possible without a pioneer of those pop intersections — the late Sophie Xeon, known mononymously as SOPHIE. While XCX’s tribute song to her, “So I,” is not on the tour’s setlist, the pulsating, metallic beats in nearly every song were born from SOPHIE’s influence.

Rather than trot Sivan out as an opening act, XCX brought him in as a co-headliner, and the show was every bit as electric with his presence. 

Sivan started the show off with a trio of his solo songs. “Got Me Started” revved up the audience for the next two tracks, “What’s The Time Where You Are” and “My My My!” and after that, the lights dimmed and a neon green “brat” curtain dropped down from the rafters.

Charli XCX emerged and fired off three “brat” club bangers. The last song of her first act, “Von Dutch,” felt like it was truly made for a stadium show. The intense reverbs matched her snarling vocals, and as imposing sounds roared from all sides, it almost felt like the roof of the Garden could collapse under her magnitude. 

The rest of the show was an exchange of audial blows between the two headliners, with each subsequent act feeling more like a command to obey the irresistible grooves and pumping beats. While there was doubtlessly a healthy dose of lip syncing coming from both performers, it was hard to pay that any mind. The music made for the most grandiose show possible, and no amount of shortcuts could cheapen that experience.

Charli XCX eventually dipped into the earlier corners of her discography. “Vroom Vroom,” one of her first collaborations with SOPHIE, has been a staple of her setlist for years. With her career in full force, it almost felt bittersweet to hear such an energetic performance. The same can be said with “I Love It,” an anthem from Swedish duo Icona Pop with Charli XCX’s vocals. Released in 2011, it’s one of the songs that first put her on the map.

Sivan closed out his portion of the show with “Rush,” a fast-paced house pop song from his recent album “Something to Give Each Other” that’s every bit as catchy as it is acclaimed. Charli XCX then joined him on stage, where the two closed out the show with their remix of “Talk Talk.”

What Charli XCX has managed to do 15 years into her career is impeccable. Capturing the monoculture and spitting it out in neon green with a crowd that understands the importance of dancing until they sweat is a feat few artists are capable of. For Sivan to match her energy and rise to the occasion is the cherry on top of their sweat-flavored cocktail.

“Shall we go back to my place?” was the final lyric Charli XCX sang as the show drew to a close. It was a fitting end that echoed throughout the Garden, as there was little doubt every Bostonian trudging out of the arena with sore legs wished they had a little more energy to go back to her place and continue the rave.

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