"What I've Done" is a song by the American rock band Linkin Park. Released on April 2, 2007, it served as the lead single from their third studio album, *Minutes to Midnight*. The track was produced by Mike Shinoda and Rick Rubin, marking a stylistic shift for the band with more emphasis on traditional rock elements compared to their earlier nu-metal sound.

Lyrically, "What I've Done" addresses themes of regret, self-reflection, and the desire for redemption. The song's poignant message is underscored by its powerful music video, which juxtaposes images of global conflict, environmental destruction, and social issues with footage of the band performing in a desert. This visual narrative reinforces the song's themes by highlighting the broader impact of human actions on the world.

Musically, the song features a driving rhythm, heavy guitar riffs, and an anthemic chorus. It opens with a memorable piano riff before launching into its full rock arrangement, showcasing Linkin Park's ability to blend melodic and aggressive elements. "What I've Done" was well-received by both fans and critics, praised for its emotional depth and production quality. It achieved significant commercial success, charting highly in multiple countries and becoming one of the band's most recognizable tracks.

Additionally, "What I've Done" gained further prominence by being featured in the end credits of the 2007 film *Transformers*, which helped to boost its popularity and reach a broader audience. The song remains a staple in Linkin Park's discography and is often highlighted in discussions about the band's evolution and impact on the rock music landscape.