It was released on 11 November 2016 by TEN Music Group and Epic Records initially as a promotional single; it was later released as the fourth single from her second studio album, So Good (2017).

[1][2] Larsson performed the song on the thirteenth series of The X Factor on 4 December 2016.

[3] On 30 December 2016, the song peaked at number two, making it her highest-charting single in the UK at the time.

"Symphony" became her highest-charting single four months later when it peaked at number one in April 2017.

The song has a sample of "Dat Sexy Body" from the Jamaican singer Sasha.