Gwen Stefani has parlayed her breakout stardom as the effervescent lead singer of the SoCal ska-punk outfit No Doubt into an enduring career as a multifaceted pop star. Before going solo, Stefani reached the top of the charts many times during No Doubt's peak. "Spiderwebs," "Just a Girl," and the ballad "Don't Speak" -- all pulled from their 1995 album Tragic Kingdom -- were iconic alternative rock hits. The early-2000s smashes "Hey Baby," "Hella Good," and "Underneath It All" found the group dabbling in pop, dance, and R&B, a musical expansion that coincided with Stefani step...