1955 oren March 20 - "Blackboard Jungle" opens in theaters featuring the song "Rock Around the Clock" by Bill Haley and his Comets, thus propelling Rock_and_Roll as a musical genre. Teenagers jump from their seats to dance to the song. April 15 - Ray Kroc starts the McDonald's fast_food restaurant chain. July 17 - Disneyland opens. September 10 - Gunsmoke debuts on CBS. September 30 - Actor James_Dean killed in car accident near Cholame, California. December 31 - 70 mm film is introduced with "Oklahoma!" 060311 what's it to you? who go blather from