Question: What was the most successful single from the motion picture soundtrack from the  1985 American drama film directed by Taylor Hackford and choreographed by Twyla Tharp and stars Mikhail Baryshnikov, Gregory Hines, Jerzy Skolimowski, Helen Mirren and Isabella Rossellini?
Context: Dancers is a 1987 film directed by Herbert Ross and stars Mikhail Baryshnikov and Julie Kent.  The story revolves around a ballet dancer who is planning to make a film version of the ballet "Giselle", and how his romance with a young woman parallels the plotline of the ballet.  The film received scathing reviews upon release. Love Ranch is a 2010 American drama film directed by Taylor Hackford and starring Helen Mirren, Joe Pesci, Sergio Peris-Mencheta, Gina Gershon and Bryan Cranston.  It was written by Mark Jacobson. In ballet, a pas de deux ] (French, literally "step of two") is a dance duet in which two dancers, typically a male and a female, perform ballet steps together.  The pas de deux is characteristic of classical ballet and can be found in many well-known ballets, including "Sleeping Beauty", "Swan Lake", and "Giselle".  It is most often performed by a male and a female (a "danseur" and a "ballerina") though there are exceptions, such as in the film "White Nights", in which a pas de deux is performed by Mikhail Baryshnikov and Gregory Hines. Walkover (Polish: Walkower ) is a 1965 Polish drama film directed by Jerzy Skolimowski.  It is the second feature film directed by Skolimowski. The Lightship is a 1986 American drama film directed by Jerzy Skolimowski.  The film stars Klaus Maria Brandauer and Robert Duvall, with early appearances from Arliss Howard and William Forsythe. Identification Marks: None (Polish: Rysopis ) is a 1964 Polish drama film directed by Jerzy Skolimowski.  It was the first feature film directed by Skolimowski, after the shorts "Erotique", "Little Hamlet", "The Menacing Eye", "Boxing" and "Your Money or Your Life". White Nights is a 1985 American drama film directed by Taylor Hackford and choreographed by Twyla Tharp and stars Mikhail Baryshnikov, Gregory Hines, Jerzy Skolimowski, Helen Mirren and Isabella Rossellini.  It was shot in Finland, Portugal, the United Kingdom, the Soviet Union and Austria. "Say You, Say Me" is a song written and recorded by Lionel Richie for the film "White Nights", starring Mikhail Baryshnikov and Gregory Hines.  The single hit number 1 in the US and on the R&B singles chart in December 1985.  It became Richie's ninth number one on the "Billboard" Adult Contemporary chart.  The track is not available on the soundtrack album to the film, because Motown did not want Richie's first single since the "Can't Slow Down" album to appear on another record label.  It finally appeared on the "Dancing on the Ceiling" album released in 1986. Ręce do góry (known in its subitled English version as Hands Up!)  is a Polish drama film directed by Jerzy Skolimowski.  It is the fourth of a series of semi-autobiographical films in which Skolimowski himself plays his "alter ego", Andrzej Leszczyc.  At the time it was banned in Poland, under the Communist regime, for 18 years because it depicted the Stalinist past. White Nights: Original Motion Picture Soundtrack is the soundtrack for the 1985 film, "White Nights".  The most successful single on the album, "Separate Lives" by Phil Collins and Marilyn Martin, reached the top of the "Billboard" Hot 100 singles chart and was nominated for an Academy Award in 1986.  The prize instead went to Lionel Richie's "Say You, Say Me", another chart topper which appeared in the film but was not included on the soundtrack due to licensing issues.
Answer: Separate Lives