Sia is one of music's hottest acts. She has written hit songs for the biggest pop artists on the planet, including Rihanna, Katy Perry, Britney Spears, Beyoncé, Kylie Minogue and Celine Dion. She was the featured vocalist on massive hits she has written for other artists, including "Titanium" for David Guetta, "Beautiful Pain" for Eminem, and "Wild Ones" for Flo Rida. She's achieved huge commercial success and is famous despite her best efforts not to be. She is iconoclastic, uncompromising, and a little zany. In 2013, she agreed to a rare interview with Billboard - but insisted on posing for the cover wearing a paper bag over her head. Despite Sia's reluctance to embrace the spotlight, her tracks having sold upwards of 13 million. She has honed her pop melodicism through a string of solo albums: 2001's Hearing Is Difficult, 2004's Colour the Small One, 2008's Some People Have Real Problems, 2010's We Are Born, 2014's 1000 Forms of Fear and 2016's This is Acting. Sia continues to tour the world.