The L.A. band Foster The People seemed to come out of nowhere back in 2011, when its song "Pumped Up Kicks" rocketed into intense, summer-long ubiquity. Torches, the album that spawned "Pumped Up Kicks," was a Grammy-nominated best-seller, and singer Mark Foster and drummer Mark Pontius performed a hugely popular Tiny Desk concert. Everything fell into place quickly.

But sustaining that success hasn't come easy. A follow-up album, 2014's Supermodel, charted well but didn't produce another huge single. Bassist Cubbie Fink left Foster The People the following year, and a third album has been in various stages of tinkering for two years now.

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