Question: What role is played by John Travolta in the film that greatly influenced the two dances, the disco fox and the hustle?

Passages:
Goin' Bananas is the fourth album by soul group Side Effect.  Released in 1977 by Fantasy Records, it was produced by Wayne Henderson.  Like other releases by the group, the work featured an R&B based sound greatly influenced by contemporary disco and jazz music.  In terms of background, the group had endured a major line-up change as singer Helen Lowe had her role taken over by Sylvia St. James. Discofox or disco fox is a social partner dance which evolved in Europe in the mid-1970s as a rediscovery of the dance hold in the improvisational disco dance scene dominated by solo dancing, approximately at the same time when the hustle emerged in the United States.  Both dances were greatly influenced by "Saturday Night Fever" starring John Travolta.  In various regions, it is also known under different names: disco hustle, swing fox, disco swing, and rock fox. Jam skating (or Jamskating) is a combination of dance, gymnastics, and skating, performed on roller skates.  The origins of jam skating are disputed, but it is often traced to the Great Lakes region and Florida.  The style has its roots in traditional roller disco, but has been greatly influenced by breakdancing, artistic skating, gymnastics, and modern dance.  Successful jam skaters are well practiced in these different forms and must have the ability to translate these movements while on skates.  Jam skating first became popular in the early 1990s and is still going strong throughout the nation.  Competitions, such as Heartbreak Skating Competition (Carrollton, GA), Pajama Jam (Franklin, IN), Southern Slam (Anderson, SC), and The Championship (Cookeville, TN) are examples of existing competitions happening.  Jam Skating, like breakdancing in its early evolution, was an almost underground movement fueled by teenagers and skaters in their early 20s.  Events were created to allow Jam Skaters to meet, trade moves, and, most importantly, "battle".  Battling and performing remain a very important aspect of Jam Skating.  This element pushes the boundaries of what is possible to perform while on skates; moreover, it ignites evolution within the skate culture. Purgatory Dance Party is the debut album by Polkadot Cadaver released via internet pre-sales on November 17, 2007, with a street date of November 27, 2007.  The cover art is a reference to the John Travolta film "Saturday Night Fever".  Dog Fashion Disco had earlier covered the theme tune to another Travolta film, "Grease". The Man in the Moone is a book by the English divine and Church of England bishop Francis Godwin (1562–1633), describing a "voyage of utopian discovery".  Long considered to be one of his early works, it is now generally thought to have been written in the late 1620s.  It was first published posthumously in 1638 under the pseudonym of Domingo Gonsales.  The work is notable for its role in what was called the "new astronomy", the branch of astronomy influenced especially by Nicolaus Copernicus.  Although Copernicus is the only astronomer mentioned by name, the book also draws on the theories of Johannes Kepler and William Gilbert.  Godwin's astronomical theories were greatly influenced by Galileo Galilei's "Sidereus Nuncius" (1610), but unlike Galileo, Godwin proposes that the dark spots on the Moon are seas, one of many parallels with Kepler's "Somnium sive opus posthumum de astronomia lunari" of 1634. Saturday Night Fever is a 1977 American musical drama film directed by John Badham.  It stars John Travolta as Tony Manero, a working-class young man who spends his weekends dancing and drinking at a local Brooklyn discothèque; Karen Gorney as Stephanie Mangano, his dance partner and eventual confidante; and Donna Pescow as Annette, Tony's former dance partner and would-be girlfriend.  While in the disco, Tony is the champion dancer.  His circle of friends and weekend dancing help him to cope with the harsh realities of his life: a dead-end job, clashes with his unsupportive and squabbling parents, racial tensions in the local community, and his general restlessness. Two of a Kind is a 1983 American romantic fantasy comedy film directed by John Herzfeld starring John Travolta and Olivia Newton-John.  The original musical score was composed by Patrick Williams.  Travolta plays a cash-strapped inventor while Newton-John plays the bank teller whom he attempts to rob.  These two unlikely individuals must come to show compassion for one another in order to delay God's judgment upon the Earth.  This is Travolta and Newton-John's second film together after 1978's "Grease", which was a success.  Despite being a critical and commercial failure, "Two of a Kind" yielded three popular singles for Newton-John and a Platinum certification for the soundtrack. Urban Cowboy is a 1980 American romantic drama film about the love-hate relationship between Buford Uan "Bud" Davis (John Travolta) and Sissy (Debra Winger).  The movie captured the late 1970s/early 1980s popularity of country music.  It was John Travolta's third major acting role after "Saturday Night Fever" and " Grease".  Much of the action centers around activities at Gilley's Club, a honky tonk in Pasadena, Texas. Forever Fever (released as "I Like It Like That" in the US) is a 1998 Singaporean musical comedy film written and directed by Glen Goei.  It stars Adrian Pang as a Bruce Lee fan who becomes interested in disco once he sees "Saturday Night Fever".  As he competes in a local disco contest, John Travolta's character enters the real world and gives him advice.  The film was released internationally by Miramax and was the first Singaporean film to perform well internationally. Normal People Scare Me: A Film about Autism is a documentary film about autism, produced by Joey Travolta, older brother of actor John Travolta.  The documentary initially began as a 10-minute short film co-directed by an autistic teenager named Taylor Cross, and his mother Keri Bowers.  Joey Travolta first met Cross at a program Travolta led teaching the art of filmmaking to children with special needs.  He helped educate Cross about filmmaking, and the documentary was expanded into a feature-length film.  It includes interviews with 65 people, including those that are autistic as well as friends and family.  Cross asks them about their experiences with autism and how they feel about it, and elicits multiple insightful responses from his subjects.

Supporting sentences:
 Both dances were greatly influenced by "Saturday Night Fever" starring John Travolta. Saturday Night Fever is a 1977 American musical drama film directed by John Badham.  It stars John Travolta as Tony Manero, a working-class young man who spends his weekends dancing and drinking at a local Brooklyn discothèque; Karen Gorney as Stephanie Mangano, his dance partner and eventual confidante; and Donna Pescow as Annette, Tony's former dance partner and would-be girlfriend.