Planet Oz is the only solo studio album by German singer and songwriter Inga Humpe, released by East West on 21 September 1990.

[2] On 18 June 1990, "Riding into Blue (Cowboy Song)" was released as the lead single from her forthcoming album, Planet Oz.

"[1] Upon its release in Europe, Music & Media described Planet Oz as "fairy-tale synthesizer pop" which "specialises in ambient ballads and sophisticated dance songs".

They noted Humpe's vocals as "sweet, with a naive, childlike quality" and added that the album sounds like "a cross between Kate Bush and Grace Jones, without the mystique or flamboyance but still possessing a dream presence".

[8] Craig Gavin of the East Kilbride World reviewed the "Do I Have To" single in 1991 and commented that it was a "surprise", having not been familiar with Humpe and so was not "expect[ing] too much".