“What I’ve Done” is a song by 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.