"The House of Blue Light" was the next album to come from the band, in 1987. Some fans noticed that the band sounded more "modern" on this album than before, which led to mixed opinions. A new version of the band's 1968 minor hit "Hush" was re-recorded in 1988 by the Mark II lineup to mark the 20th anniversary of Deep Purple. However, Ian and Ritchie started arguing again over the future of the band, and their differences had torn their working relationship too far apart, meaning Gillan was fired in 1989. Blackmore seemed to want to make the band sound more commercial (something he had tried to do with his band Rainbow back in the early 1980s). He hired Joe Lynn Turner (also a former Rainbow singer) to replace Gillan, and the Mark V band released "Slaves and Masters" in 1990.