A good song can work magic on a movie, turning a bad film into something memorable or a good one into a classic. The seven following numbers are songs that have left an indelible mark on moviegoers' memories. Somewhere Out There The song appears in the middle of the animated film An American Tail, a story about a family of mice who emigrate to America. The song describes the feelings of two sibling mice after they are accidentally separated. The melodic ballad, performed by Linda Ronstadt and James Ingram, won the Song of the Year Grammy in 1988. As Time Goes By The song was originally written for a Broadway musical but it didn't become a hit until it was reintroduced in the timeless movie classic Casablanca. The song is not really catchy enough to be a classic, but its association with Casablanca has been enough to win the hearts and minds of lovebirds everywhere. Unchained Melody As one of the 20th century's most recorded songs, the version by the Righteous Brothers reappeared in the pop charts. It became Britain's top-selling single in 1990 after being used in one of the most memorable scenes in the supernatural romance Ghost starring Demi Moore and Patrick Swayze. Over the Rainbow The song, performed by Judy Garland in The Wizard of Oz, is perhaps the most popular movie song ever. Its simple and beautiful lyrics express hope for a bright new world somewhere at the end of the rainbow. The song was also used ironically by John Woo in a gun battle scene in Face/Off. The Sound of Silence The Simon and Garfunkel song, an anthem during the 1960s, plays during the opening frames of The Graduate. The comedy romance stars Dustin Hoffman as an aimless college graduate who falls for a middle-aged woman and then for her daughter. The lyrics lament the breakdown of communication in society. California Dreaming Most local moviegoers will associate the song by The Mamas & the Papas - ranked 89th in Rolling Stone's list of The 500 Greatest Songs of All Time - with Wong Kar-wai's Chungking Express. The energetic and stylish movie uses the song to highlight the relationship between a policeman and a wayward young woman. I Will Always Love You The 1974 song was written and performed by American singer-songwriter Dolly Parton but was re-recorded by Whitney Houston for The Bodyguard, a movie in which she stars with Kevin Costner. While The Bodyguard was an uninspiring movie, the ballad has become Houston's signature and was one of the most popular love songs of the 1990s.