Following the release of her first EP, Barnett signed to U.K.-based label Marathon Artists (via its imprint House Anxiety) to release, The Double EP: A Sea of Split Peas, a combined package of Barnett's first and second EPs
Marathon Artists partnered with Mom + Pop Music for the U.S. release of The Double EP in 2014. In March 2016, Barnett released her heavily anticipated first full-length, Sometimes I Sit and Think, and Sometimes I Just Sit. A critical and cult success, Sometimes I Sit wound up peaking at number four in Australia, 16 in the U.K. and reached 20 in the U.S.; she’d later be nominated for Best International Female at the 2016 Brits and Best New Artist at the 2016 Grammys. Barnett follower her acclaimed debut by teaming up with Kurt Vile for the duet album Lotta Sea Lice. The record was released in October 2017 by Marathon Artists and Matador Records.