Question: Are Johnette Napolitano and Andi Deris both singers?
Sentence (from "Andi Deris"): Andreas "Andi" Deris (born 18 August 1964) is a German singer and songwriter, best known as the lead vocalist of power metal band Helloween, and co-founder and former lead singer of German melodic metal band Pink Cream 69.
Relevant evidence: Yes