Outside was a concept album first released on September 25, 1995 by David Bowie, his 19th studio album. The album was Bowie's reunion with Brian Eno, whom Bowie had worked with most famously on his Berlin Trilogy in the 1970s. Subtitled "the Ritual Art-Murder of Baby Grace Blue: A non-linear Gothic Drama Hyper-Cycle", Outside centers on the characters of a dystopian world on the eve of the 21st century. The album put Bowie back into the mainstream scene of rock music with its singles "The Hearts Filthy Lesson", "Strangers When We Meet", and "Hallo Spaceboy" (remixed by the Pet Shop Boys).