"Sunday Bloody Sunday" is the opening track from U2's 1983 album, War. The song was released as the album's third single on 11 March 1983 in Germany and The Netherlands. "Sunday Bloody Sunday" is noted for its militaristic drumbeat, harsh guitar, and melodic harmonies. One of U2's most overtly political songs, its lyrics describe the horror felt by an observer of The Troubles in Northern Ireland, mainly focusing on the Bloody Sunday incident in Derry where British troops shot and killed civil rights marchers. Along with "New Year's Day", the song helped U2 reach a wider listening audience. It was generally well-received by critics on the album's release.
The song has remained a staple of U2's live concerts. During its earliest performances, the song created controversy. Bono reasserted the song's anti-sectarian-violence message to his audience for many years. Today, it is considered one of U2's signature songs, being one of the band's most performed songs. Critics rate it among the best political protest songs, and it has been covered by over a dozen artists. It was named the 268th greatest song by Rolling Stone on their list of "The 500 Greatest Songs of All Time".