The Rumba was originally a marriage dance. Many of its movements and actions which seem to have an erotic meaning are merely depictions of simple farm tasks. The shoeing of the mare, the climbing of a rope, the courtship of the rooster and the hen, etc. It was done for amusement on the farms by the black population of Cuba. However, it became a popular ballroom dance and was introduced in the United States about 1933. It was the Americanized version for the Cuban Son and Danzon. It is in 4/4 time. The characteristic feature is to take each step without initially placing the weight on that step. Steps are made with a slightly bent knee which, when straightened, causes the hips to sway from side to side in what has come to be known as "Cuban Motion."