Premise: Gwen Stefani . She is the co-founder and 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 '' , `` Do n't Speak '' , `` Hey Baby '' , and `` It 's My Life '' . Including her work with No Doubt , Stefani has sold more than 30 million albums worldwide .
Hypothesis: Gwen Stefani is in a exclusively British rock band.
Label: NEUTRAL