Set It All Free is a song from the animation movie Sing (《欢乐好声音》). It is sung by the US actress Scarlett Johansson. She voiced the character Ash in the movie, a rebellious (叛逆的) porcupine (豪猪) who loves to sing rock music. In the movie, she starts a rock band with her boyfriend, but he keeps making her feel like she has no musical talent. This leads Ash to leave him and start a solo career (单飞生涯). Her performances on stage gradually helped her overcome her doubts. This song is about her determination (决心) and courage (勇气).