She is known for her anachronistic voice and work that weaves older styles with the modern, escaping simple classification.

[5] A number of solo records followed, including the all acoustic Hazel Eyes, I Will Lead You,[3] an unorthodox collection of 19th century German Lieder titled A Wolf in Sheep's Clothing,[6] and This Coming Gladness, a psychedelic folk-rock album.

[9] Thereafter she began to record frequently with engineer Andrija Tokic, who co-produced with Foster her solo albums Blood Rushing,[10] I'm A Dreamer,[11] and Faithful Fairy Harmony;[12] also More Amor, a psych-folk album by her new band Mendrugo formed with Victor Herrero.

[13] The title song from I'm A Dreamer was featured in Season 2, episode 7 of the British television show The End of the F***ing World.

[14] Foster also lent her voice to the soundtrack for the 2020 film, The World to Come, and sung (as well as co-wrote) the titular song over the end credits.