One is a song from the musical A Chorus Line.

Director Michael Bennett explained his view regarding the song's inception and placement within the show:^[1]

I want the audience to walk out of the theatre saying, 'Those kids shouldn't be in a chorus!' And I want people in the audience to go to other shows and think about what's really gone into making that chorus . . . It fades with them kicking. That's it. That's the end of the show. There are no bows. I don't believe in bows, just the fade out. That's what a dancer's life is.

CityBeat described the song as "the show’s greatest emotional wallop".^[2] The Davis Enterprise dubbed it the show's "signature tune".^[3]

In 1976, the Brady family performed the song in the pilot episode of The Brady Bunch Variety Hour.

On Sesame Street, it was covered by 10 Muppet numbers in a chorus line.

The Simpsons parodied the song in the episode "Treehouse of Horror V".

Catherine Zeta-Jones performed the song, with modified lyrics, in dedication to her husband Michael Douglas during the 2009 AFI Lifetime Achievement Award Ceremony.