<Tr> <Td> 1 . </Td> <Td> "Survivalism" </Td> <Td> 4: 22 </Td> </Tr> <Tr> <Td> 2 . </Td> <Td> "Survivalism_OpalHeartClinic_Niggy_Tardust! (Escaped ..." </Td> <Td> 4: 18 </Td> </Tr> <Ul> <Li> Trent Reznor--lyrics, performance, and production </Li> <Li> Atticus Ross--production </Li> <Li> Thavius Beck--production on "Tardusted" and "OpalHeartClinic_Niggy_Tardust! (Escaped ..." remixes </Li> <Li> Saul Williams--backing vocals </Li> </Ul> <Li> Trent Reznor--lyrics, performance, and production </Li>

Who sang backing vocals on the nine inch nails song survivalism