Gwen Stefani Debuts New Ballad 'Start a War' at Solo Show

No Doubt singer performs her first full solo concert in nearly eight years

24 hours before Music's Biggest Night, Gwen Stefani threw a pre-Grammy bash at Los Angeles' Orpheum Theatre, where she performed her first full solo concert in almost eight years. At the Orpheum show, in addition to tracks culled from her solo LPs Love.Angel.Music.Baby and The Sweet Escape, Stefani sang her two new singles "Spark the Fire" and "Baby Don't Lie," her Calvin Harris collaboration "Together" and, for the first time, a new ballad called "Start a War," co-written by Sia.

Stefani, who will perform alongside her fellow The Voice mentor Adam Levine at the 57th annual Grammys, staged the gig for 2,000 fans and lucky winners of the MasterCard Priceless Surprises contest, Beacon Street reports. Keeping with Stefani tradition, the singer chose not to perform any No Doubt tracks live without her band mates, instead focusing completely on her solo work.

Despite performing her first full solo gig since November 2007, Stefani told Rolling Stone that she probably won't tour in support of her upcoming solo album, which features tracks co-written with Pharrell, Harris, and Charli XCX. Instead, she'll switch her focus back to No Doubt and a follow-up to their 2013 comeback album Push and Shove. The Rock Steady band have already begun booking festival slots this summer, including stops at New Orleans' Jazz Festival, Napa, California's BottleRock and Las Vegas' Rock in Rio USA.

"I'm shocked people still care," Stefani said. "Doing another solo record and recording No Doubt music and being on The Voice and having three boys all at one time, that just wasn't something I could dream up in my mind."