"Iridescent" is a song by American rock band Linkin Park. It was announced as the band's third US, fourth international and overall final single from their fourth studio album, A Thousand Suns, which was released on September 14, 2010. A music video for the song was directed by Joe Hahn, the band's turntablist. "Iridescent" serves as the theme song for the film Transformers: Dark of the Moon, continuing the streak of the band's songs serving as the theme songs of the Transformers films, and was remixed in Dolby Surround 7.1 for the movie's release. The song received positive reviews and became a moderate success worldwide.