Catherine took up songwriting, and in addition to performing her own material, she began making homemade videos of herself performing current pop hits, which she posted online. Catherine's style was informed by contemporary pop as well as the updated country sounds of artists such as Taylor Swift
, Kacey Musgraves
and Maddie & Tae
. Her videos attracted the attention of Instrumental, a company that finds talent online and grooms them for larger success; Catherine moved to London to work with the firm, and after only a few months, she began traveling to Nashville for periodic songwriting and recording sessions. In the summer of 2016, then only 19, she landed a recording contract with Warner Bros. Records, and December 2016 saw the release of her debut EP, a four-song release titled One.