Rock ’n roll is really swing with a modern name. It began on the levees and plantations, took in folk songs, and features blues and rhythm. It's the rhythm that gets to the kids – they're starved of music they can dance to, after all those years of crooners.
For hardly any man dances when sober, unless he is insane. Nor does he dance while alone, nor at a respectable and moderate party. Dancing is the final phase of a wild party with fancy decorations and a multitude of delights.
There comes a pause, for human strength will not endure to dance without cessation; and everyone must reach the point at length of absolute prostration.
It is interesting that Hindus, when they speak of the creation of the universe do not call it the work of God, they call it the play of God, the Vishnu lila, lila meaning play. And they look upon the whole manifestation of all the universes as a play, as a sport, as a kind of dance — lila perhaps being somewhat related to our word lilt
It may be possible to do without dancing entirely. Instances have been known of young people passing many, many months successively without being at any ball of any description, and no material injury accrue either to body or mind.