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? 
Johnny Hallyday: Johnny Hallyday (] , stage name of Jean-Philippe Smet, born 15 June 1943) is a French singer and actor. Sylvie Vartan:  Her performances often featured elaborate show-dance choreography, and she made many appearances on French and Italian TV.
i don't know