Blues can be subdivided into several subgenres ranging from country to urban blues that were more or less popular during different periods of the 20th century. Best known are the Delta, Piedmont, Jump and Chicago blues styles. World War II marked the transition from acoustic to electric blues and the progressive opening of blues music to a wider audience. In the 1960s and 1970s, a hybrid form called blues rock evolved. The America's Music Legacy series was recorded 1983-85 and produced by 20TH Century Home Entertainment. It showcases the musical legends performing the songs that continue to attract and entice the whole world, because they truly are the best of all that is America. The program is hosted by Brock Peters and features performances by B.B. King, Buddy Guy, Pee Wee Crayton, Jimmy Rushing, Ernie Andrews, and many more.