"What I've Done" is a song by the American rock band Linkin Park. It was released as the first single from their third album, Minutes to Midnight. The song is composed in the key of G minor and is set in 4/4 time. The song was released as a radio single on April 1, 2007, as a digital download on April 2, and as a CD single on April 30. The live version of "What I've Done" from Road to Revolution: Live at Milton Keynes was nominated for Best Hard Rock Performance at the 52nd Grammy Awards, but did not win. It also serves as the main theme of Transformers and also appears on Transformers: The Album. The song was featured in the video game Guitar Hero World Tour. In January 2011, it was released in a Linkin Park DLC pack for Rock Band 3, along with a PRO mode update, which allows use of real instruments such as guitar, keyboards and electronic drumkits. The song is also a b-side to the UK single of "Iridescent". An instrumental version of the song is currently used by Sky as background music for their interactive services.