Something of an umbrella term, swing dance covers a succession of couple dances that stem from the Lindy Hop or jitterbug, generated and enhanced at the Savoy Ballroom in the late 1920s. Specific steps are danced in an unset order, with the embellishment of centrifugal spins, swing outs, breaks, and solo improvisation. Acrobatic lifts and air steps add to the general exuberance, and set routines can be interspersed with spontaneous exhibition. When swing music of big bands like those of Benny Goodman, Count Basie, and Duke Ellington became popular in the 1930s, the dance took on a smoother, more elongated shape and, in more complex performance styles, was presented on stage and screen, most notably in the movie Hellzapoppin (1941). Life magazine proclaimed swing "America's national dance" in 1943. Swing dancing underwent an intense revival in the 1980s, as a couple demonstration of some of the high risk elements of hip-hop. Frankie Manning played a major role in the early choreographic development of swing dance as well as in its recent revival. Influenced initially by African forms, the raw energy and virtuosity of swing dancing is perpetuated by more than 350 organizations and clubs in the United States and Europe.