Question: Svetha Rao, professionally known as Raja Kumari, is an Indian American songwriter, rapper and recording artist from Claremont, California, Kumari is best known for her collaboration with notable artists including Gwen Stefani, she is a co-founder and the lead vocalist of which band?
Sentence (from "Spark the Fire"): Stefani wrote "Spark the Fire" in collaboration with the song's producer Pharrell Williams.
Relevant evidence: No