Question: Are both Ontronik Khachaturian and Siouxsie Sioux singers and producers?
Sentence (from "Siouxsie Sioux"): Susan Janet Ballion, better known by her stage name Siouxsie Sioux (/ˈsuːziː suː/ , born 27 May 1957), is an English singer, songwriter, musician and producer.
Relevant evidence: Yes