Question: Stargate is a Norwegian record producing and songwriting team composed of Tor Erik Hermansen, and Mikkel Storleer Eriksen, and have produced and written or only produced for stars including which Australian singer-songwriter, record producer and music video director, and started her career as a singer in the local Adelaide acid jazz band Crisp in the mid-1990s?
Sentence (from "Sia (musician)"): She then moved to London, England, and provided lead vocals for the British duo Zero 7.
Relevant evidence: No