The six-piece performed the track during their current US tour
Sheridan Coldstream couldn't believe it when Eilish sang along with his piano accompaniment and instructions
The environmentally-focused band chose the 2019 song because of its "powerful message" about climate change
Dora Jar and Sampa the Great will split up opening duties on the tour, which kicks off next month
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Eilish marked the one-year anniversary of the release of 'Happier Than Ever' with a surprise performance at Amoeba Music in Hollywood
"There's other artists there – you bump into them, you look stupid"
The singer also said she's "going to hopefully make another album in the next year"
Including an entirely new standing section
Earlier this year Eilish said that she hopes to release a new album in 2023