Last night, Gwen Stefani threw a pre-Grammy bash at Los Angeles’ Orpheum Theatre. She performed her first full solo concert in almost eight years. In addition to tracks 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.

Tonight, Stefani will perform alongside her fellow The Voice mentor Adam Levine at the 57th annual Grammys.

Listen to her new track “Start a War” below