Multi-instrumentalist Spencer Ernst, meanwhile, cribs a line from their breakthrough hit to explain his 2019: "I'd say we've been having dreams -- and they're coming true," he laughs.
Now, the group is looking toward what's next. While "Trampoline" shows no signs of stopping, Shaed released follow-up single "Thunder" over the summer, which is also a hit at alternative radio. But they're not in any rush for radio to abandon "Trampoline" in favor of their next song.
"We've been getting good, positive feedback on the new song, but these stations are definitely like, 'You know, we're still pushing "Trampoline" real hard,'" Spencer says. "So it's just a timing thing."
One of the factors behind the longevity of "Trampoline" is a remix released in September featuring Zayn. On the new version, the One Direction alum trades lines with Chelsea, turning the once-solo song into a male-female conversation. Spencer and his twin brother (and fellow multi-instrumentalist) Max Ernst recalled a happy accident that led to some interesting vocal choices from Zayn on the remix.
"In the chaos of sending it to his team when we found out he was interested, one of our label reps Drew -- I'm going to throw him under the bus here -- he sent the demo version of the song to Zayn," Max says. "So [the version] before we had kind of finalized the vocals and we had kind of different vocal melodies and stuff. So initially Spence and I were very, very concerned when we realized."
"We were like, 'Drew, what did you do?!,'" Spencer recalls.
"[Zayn] actually sang a melody that was no longer in our version, but we ended up using it on the track," Max says. "[Zayn's] 'so loved' part ... it's like an answering counter-melody that's really high, and his falsetto became like a really cool hook."
"Thanks, Drew!" the trio laughs.
The band has been on tour for months, including one especially poignant hometown show. "We got to headline the 9:30 Club in D.C., our hometown," Spencer says. "It's like our favorite venue. it's actually where we met Chelsea as well, so there's just like a lot of full-circle [moments], and it sold out. It was just a real special night."
After not being home for more than two days in a row in months, their final concert of 2019 is on Dec. 15 in Milwaukee. They've been busy working on their full-length debut album on the road, and they're excited for fans to hear the new music soon. "We can't say yet, but we've been able to collaborate with some amazing artists that we've always wanted to," Max teases about the project.
Also on the show, Keith & Katie review the 2020 Grammy nominations and some of our biggest surprises. Plus, new No. 1s on both the Billboard 200 (Celine Dion's Courage) and Hot 100 (Post Malone's "Circles").
The Billboard Pop Shop Podcast is your one-stop shop for all things pop on Billboard's weekly charts. You can always count on a lively discussion about the latest pop news, fun chart stats and stories, new music, and guest interviews with music stars and folks from the world of pop. Casual pop fans and chart junkies can hear Billboard's senior director of charts Keith Caulfield and deputy editor, digital Katie Atkinson every week on the podcast, which can be streamed on Billboard.com or downloaded in Apple Podcasts or your favorite podcast provider. (Click here to listen to the previous edition of the show on Billboard.com.