Since the 90's, as the music industry went through several transformations, Bowie moved away from commercial pop oriented songs, and towards more experimental, highly charged and challenging music and lyrics, which although they have met with critical acclaim, have not received much airplay, nonetheless, Bowie has remained a popular tour act, although his tours are getting farther and farther in between (his last major tour was in 2004, and there have been rumors about Bowie's health for the past several years).
ADG