Music for the waltz should be in 3/4 time, and played at 29 to 34 bars per minute. The accent is on the first beat of each bar. For beginners it is a simple dance compared to some others. At competitive level it is much more demanding. It features whisks, chassés, spins, hesitations, drags, and split-beat steps, many of which have been copied in other dances. The first 'advanced' figure to be invented was the double reverse spin, by Maxwell Stewart in the 1924 World Championship. Nowadays it is taught at the silver medal stage.