Who performed the theme song from the film Avatar?

"I See You (Theme from Avatar)" (also referred to as "I See You") is the official theme song recorded by British singer Leona Lewis for the 2009 film Avatar, directed by James Cameron, and its accompanying soundtrack (2009). It was written by James Horner and Kuk Harrell, with production done by Simon Franglen. A pop inspired ballad, the lyrics, which reflect the story line of the film, are about love, emotion and power.

The song received multiple comparisons to Celine Dion's "My Heart Will Go On", which is the official theme song written by Horner for another film directed by Cameron, Titanic (1997). Lewis has performed the song on So You Think You Can Dance and Today, and it was included on the set list of her debut concert tour, The Labyrinth (2010). It peaked at number 47 on the Irish Singles Chart and number 24 on the US Adult Contemporary chart.