Question: Which singer is also a musician, Gwen Stefani or Charlie Simpson?
Sentence (from "Gwen Stefani"): She is a co-founder and the lead vocalist of the band No Doubt that experienced major success after their breakthrough studio album "Tragic Kingdom" (1995) along with various successful singles, including "Just a Girl", "Don't Speak", "Hey Baby", and "It's My Life".
Relevant evidence: No