18. Sia
Image Source: allure.com
Sia started her successful career writing songs for stars such as Rihanna and Flo Rida. In 2014, she decided to release her own solo album, which became number 1 on the Billboard charts. In 2016, she released her song ‘Cheap Thrills’ and stole the charts once again. A powerhouse vocalist with a unique wardrobe makes Sia a no-brainer on this list.