冨田勲
The musical score for "Alien" was composed by Jerry Goldsmith, conducted by Lionel Newman, and performed by the National Philharmonic Orchestra. Ridley Scott had originally wanted the film to be scored by Isao Tomita, but 20th Century Fox wanted a more familiar composer and Goldsmith was recommended by then-president of Fox Alan Ladd Jr. Goldsmith wanted to create a sense of romanticism and lyrical mystery in the film's opening scenes, which would build throughout the film to suspense and fear. Scott did not like Goldsmith's original main title piece, however, so Goldsmith rewrote it as "the obvious thing: weird and strange, and which everybody loved." Another source of tension was editor Terry Rawlings' choice to use pieces of Goldsmith's music from previous films, including a piece from "", and to use an excerpt from Howard Hanson's Symphony No. 2 ("Romantic") for the end credits.