Question: Who is the singer for system of a down?
Disambiguated questions and answers: question: Who is the lead singer for system of a down?
Who is the co-lead singer for system of a down?
Who is the backing singer for system of a down?
answer: Serj Tankian
Daron Vartan Malakian
Daron Malakian
Shavo Odadjian
Shavarsh "Shavo" Odadjian
Natural Questions answer: Serj Tankian (from the Wikipedia article "Serj Tankian")