“Evergreen” is a song written by Barbara Streisand and Paul Williams, originally released on Barbra’s album “A Star Is Born” in 1976. However the song was much more popular as a cover when it was re-released after being featured in the movie version of A Star Is Born (in which Streisand starred).
The song would go on to be the biggest hit of Streisand’s career (until “Woman In Love” in 1980) and is one of the biggest selling singles ever. Barbara herself has said that when she writes a song with Paul Williams she thinks it won’t be very successful because he is too difficult to work with, but then she releases the song anyway and goes on to win awards with it.