Question: Johnny Hallyday is a French singer and actor once married for 15 years to popular Bulgarian-French singer Sylvie Vartan whose performances often featured what type of choreography? 

full_context: Document 1: Yvonne De Carlo: Yvonne De Carlo (born Margaret Yvonne Middleton; September 1, 1922 – January 8, 2007) was a Canadian-American actress, dancer, and singer. A brunette with blue-gray eyes, she became an internationally famous Hollywood film star in the 1940s and 1950s, made several recordings, and later acted on television and stage.
Document 2: Johnny Hallyday: Johnny Hallyday (] , stage name of Jean-Philippe Smet, born 15 June 1943) is a French singer and actor. He was married for 15 years to popular Bulgarian-French singer Sylvie Vartan and the two were considered a "golden couple" for 20 years. Hallyday has completed 181 tours, had 18 platinum albums, and has sold more than 110 million records worldwide, making him one of the world's best-selling artists of all time.
Document 3: David Hallyday: David Hallyday (born David Michael Benjamin Smet; 14 August 1966) is a French singer, songwriter and amateur sports car racer. He was born in Boulogne-Billancourt and is the son of the French singers Sylvie Vartan and Johnny Hallyday. David Hallyday is a first cousin of actor Michael Vartan.
Document 4: Le Lido: Le Lido is a cabaret and burlesque show located on the Champs-Élysées in Paris, France. It opened in 1946 at 78 Avenue des Champs -Élysée and moved to its current location in 1977. It is known for its exotic shows including dancers, singers, and other performers. Famous names have performed there including: Edith Piaf, Siegfried and Roy, Sylvie Vartan, Johnny Hallyday, Maurice Chevalier, Marlene Dietrich, Eartha Kitt, Josephine Baker, Kessler Twins, Elton John, Laurel & Hardy, Dalida, Shirley MacLaine, Mitzi Gaynor, Juliet Prowse and Noël Coward.
Document 5: Vanessa Paradis: Vanessa Chantal Paradis (] ; born 22 December 1972) is a French singer-songwriter, musician, actress and model.
Document 6: Jean-Jacques Debout: Jean-Jacques Debout (born 9 March 1940, in Paris) is a French singer-songwriter. In addition to his albums, he has written for a number of renowned artists like Johnny Hallyday, Sylvie Vartan, Dalida, and Chantal Goya. He has also composed a great number of films.
Document 7: Tony Scotti: Anthony Joseph "Tony" Scotti (born December 22, 1939) is an American actor, television and film producer, and co-founder of Scotti Brothers Records. He is married to French singer Sylvie Vartan.
Document 8: Jane Birkin: Jane Mallory Birkin, OBE (born 14 December 1946) is an English-French actress, singer, songwriter, and model. She attained international notoriety for her decade-long musical partnership with Serge Gainsbourg, and also had a prolific career as an actress in British and French cinema.
Document 9: Cher: Cher ( ; born Cherilyn Sarkisian; May 20, 1946) is an American singer and actress. Sometimes referred to as the Goddess of Pop, she has been described as embodying female autonomy in a male-dominated industry. She is known for her distinctive contralto singing voice and for having worked in numerous areas of entertainment, as well as adopting a variety of styles and appearances during her five-decade-long career.
Document 10: Didier Barbelivien: Didier René Henri Barbelivien (born 10 March 1954 in Paris) is a French author, lyricist, songwriter and singer. Beginning in the 1970s, he wrote a number of successful songs for artists such as: Dalida, Johnny Hallyday, Michel Sardou, Daniel Guichard, Claude François, Gilbert Montagné, Sylvie Vartan, Patti Layne, Gilbert Bécaud, Enrico Macias, Demis Roussos, Mireille Mathieu, Hervé Vilard, Michèle Torr, C. Jérôme, Christophe, Julio Iglesias, Sheila, Nicole Croisille, Patricia Kaas, Eric Charden, Jean-Pierre François, Michel Delpech, Philippe Lavil, Elsa, Gérard Lenorman, Ringo, Garou, Corynne Charby, David and Jonathan, and Caroline Legrand among others.
Document 11: Sylvie Vartan: Sylvie Vartan (born Sylvie Georges Vartanian; 15 August 1944) is a French singer and actress. She is known as one of the most productive and tough-sounding yé-yé artists. Her performances often featured elaborate show-dance choreography, and she made many appearances on French and Italian TV. Yearly shows with then-husband Johnny Hallyday attracted full houses at the Olympia and the Palais des congrès de Paris throughout the 1960s and mid-1970s. In 2004, after a break in performances, she began recording and giving concerts of jazz ballads in francophone countries.
Document 12: J'ai un problème: "J'ai un problème" is a French language song, a duet by Sylvie Vartan and Johnny Hallyday. However, the single cover credited a shortened version of their name as Sylvie & Johnny.
Document 13: Rough Town: Rough Town is a 1994 album recorded by French singer Johnny Hallyday. It is entirely written in English-language to win over the anglophone countries. It was released in September 1994 and achieved success in France, where it debuted at the top of the charts on October 2, 1994, but dropped just after and stayed for nine weeks on the chart (top 50). It provided two singles in France, "I Wanna Make Love To You" (#18) and "Love Affair" (#35), a duet with Kathy Mattea. The album was also released in Germany, but was unsuccessful in this country. The video for "Love Affair" was directed by Dani Jacobs, filmed in Nashville and features Johnny and Kathy Mattea who duets on this track.
Document 14: Sylvie Vartan discography: This page presents the discography of French singer Sylvie Vartan.
Document 15: Marion Cotillard: Marion Cotillard (] ; born 30 September 1975) is a French actress, singer-songwriter, musician, environmentalist and spokesperson for Greenpeace who achieved international fame with the film "La Vie en Rose" (2007). She is the recipient of an Academy Award, a BAFTA Award, a Golden Globe Award, two César Awards, a European Award, and a Lumières Award. Cotillard has appeared in more than 50 feature films and is also known for being the face of Lady Dior handbags since 2008. She became a Knight of the Order of Arts and Letters in France in 2010 and promoted to Officer in 2016. Was named "The Most Bankable French Actress of the 21st Century" in 2014, and described as "the great silent film actress of our time" by The Daily Telegraph's Robbie Collin, for her ability to show emotions only with her eyes and facial expressions, although she has never appeared in a silent film. She received France's highest honor and was made a Knight of the Legion of Honour in 2016.
ground_truth: show-dance