She has also recorded songs for film and television soundtracks, starting in 2001 with the release of the Mandarin version of "Where the Dream Takes You" for the American animated film, Atlantis: The Lost Empire (2001).[5] She followed it with songs including "Angel of Love", "Darkness", and "Sweetie" for the Hong Kong film, Why Me, Sweetie?! (2003), as well as "Warriors in Peace" for the Chinese film, Warriors of Heaven and Earth (2003).[6][7] In 2014, Tsai recorded the theme song named "Kaleidoscope" for the Chinese film, Tiny Times 3.[8] In 2017, she recorded the theme song named "On Happiness Road" for the Taiwanese animated film under the same title and the theme song named "Stand Up" for the Chinese film, Monster Hunt 2 (2018).[9][10] In 2020, she recorded the songs "Who Am I", "Opposite", and "Turn Back Time" for the Chinese series, The Wolf (2020).[11] In 2022, she recorded the theme song named "Untitled" for the Taiwanese film, Marry My Dead Body (2023).[12] Her most recent song recorded for a series was "Someday, Somewhere" for the Taiwanese series, At the Moment (2023).[13]
"Little Child" is a song written by Stone, Ashin, and Chen Mo and tailored for Tsai. Tsai performed a live version of this song on 2013 Summer Super Slippa in Taipei for the first time. The song later became the theme song of the 2013 Taiwanese film, Endless Nights in Aurora, and recorded by Fish Leong. Tsai also performed the song on both Zhengzhou and Chengdu dates of her Play World Tour in 2016 and Double Play Fan Meeting in Taipei in 2018.