[5] To further her career, Inga moved to England where she worked a guest vocalist for Johnny Logan[10] and Howard Jones.

[11][12] Inga Humpe 's first solo album was released in 1990 under the title Planet Oz, where she collaborated with a number of producers and writers.

[13] She also worked with Thomas Fehlman and Andy Richards and recorded covers of "Somethin' Stupid" and the Pet Shop Boys' "Do I Have To".

[5] Throughout her career Humpe often featured as a guest vocalist, notably on recordings by the artists Stephan Remmler,[14][15] Falco and Marc Almond.

[17][12][18] In 2019, she published the co-authored book Wir trafen uns in einem Garten with photographs, biographical details and song lyrics.