The song "Clocks" by Coldplay is originally in the key of C minor. It was released as the third single from their second studio album, "A Rush of Blood to the Head," in 2003. The song was written by all members of Coldplay - Chris Martin, Jonny Buckland, Guy Berryman, and Will Champion. "Clocks" has become one of Coldplay's most successful and iconic songs, receiving numerous awards and nominations. Fun fact: The distinctive piano riff in the song was inspired by Johann Sebastian Bach's "Prelude No. 2 in C minor." The melody in "Clocks" is characterized by its catchy and soaring piano-driven sound, supported by Martin's heartfelt vocals and the band's atmospheric instrumentals.