What makes Bird Set Free by Sia notable?

'Bird Set Free' gained significant attention as part of the soundtrack for the critically acclaimed film 'Lion,' which helped introduce Sia's music to a wider audience. The song also exemplified her commercial success, charting on various Billboard lists and further establishing her influence in pop music. By the time 'Bird Set Free' was released in 2015, Sia had transitioned from a behind-the-scenes songwriter to a prominent solo artist, following her breakthrough album '1000 Forms of Fear' in 2014. This single marked her continued ascent in the music industry, showcasing her distinctive sound and lyrical vulnerability.