"Helena" (alternatively titled "Helena (So Long & Goodnight)") is a song by the American rock band My Chemical Romance from their second studio album, Three Cheers for Sweet Revenge (2004). It was released as the album's second single on March 8, 2005. An emo song, it was created in memory of band members Gerard Way and Mikey Way's late grandmother, who died while the band was touring and unable to visit her during the last year of her life. Although it was one of the last tracks on the album to be written, the direction that Gerard Way took it in influenced the rest of Three Cheers for Sweet Revenge's tracks. A music video, directed by Marc Webb and filmed at a church in Los Angeles, was also released.