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"One Tree Hill" is a song by Irish rock band U2 and the ninth track from their 1987 album,The Joshua Tree. The song was released as the album's fifth and final single exclusively in New Zealand in March 1988, where it became the band's first #1 single there. The song was written in memory of lead singer Bono's personal assistant, Greg Carroll, a New Zealand native. The title of the song refers to One Tree Hill, a volcanic peak in Auckland, New Zealand.