During his years in the professional wrestling business, Hart composed many theme songs for wrestlers in the WWF and WCW. Some of the wrestlers for whom he composed music were Honky Tonk Man, Jimmy Snuka, Brutus "The Barber" Beefcake, The Rockers, The Hart Foundation, Crush, the Fabulous Rougeau Brothers, Dusty Rhodes, the Legion of Doom, the Nasty Boys, Ted DiBiase, the Mountie, Hulk Hogan, Sting, the nWo Wolfpac, and 3 Count. He also composed the themes for "SummerSlam '88" (which was later reused as the theme for many early "Royal Rumble" events) and "WrestleMania VI" (which was later used for the seventh, eighth, ninth, and tenth events). One of Hart's most notable compositions is Shawn Michaels's entrance theme, "Sexy Boy."