Patrick Bateman is the third EP by black metal band Krieg, the title comes from the starring character of which novel, by Bret Easton Ellis, published in 1991?
Patrick Bateman (EP):  The title comes from the starring character of the novel "American Psycho". American Psycho: American Psycho is a novel by Bret Easton Ellis, published in 1991.
American Psycho