Among the many losses which this art has sustained, one surely, not the least regrettable, even for our theatres, was that of the dances in armour, practised by the Greeks, which they used by way of diversion and of _exercise_ for invigorating their bodies. Sometimes they had only bucklers and javelins in their hands: but, on certain occasions they performed in panoply, or complete suits of armour. Strengthened by their daily and various manly exercises, they were enabled to execute these dances, with a surprising exactness and dexterity. The martial simphony that accompanied them, was performed by a numerous band of music; for the clash of their arms being so loud, would else have drowned the tune or airs of the musicians. It is impossible to imagine a more sublime, splendid and picturesque sight than what these dances afforded, in the brilliancy of their arms, and the variety of their evolutions; while the delight they took in it, inspired them with as much martial fire, as if they had been actually going to meet the enemy. And indeed this diversion was so much of the nature of the military exercise, that none could be admitted who were not thoroughly expert in all martial training. In time of peace, this kind of dance was considered as even necessary to keep up that suppleness and athletic disposition of body, to bear action and fatigue, essential to the military profession. If the practice had been neglected, but for a few days, they observed a numbness insensibly diffuse itself over the whole body. They were persuaded then that the best way of preserving their health, and fitness for action, and consequently to qualify them for the most heroic enterprizes, was to keep up this kind of exercise, in the form of diversion.

These martial dances, have, in some operas of Italy, been attempted to be imitated, with some degree of success: but as the performers had not been trained up to such an exercise, like the Greeks, it was not to be expected that the representation should have the same perfection, or color of life.

A Treatise on the Art of Dancing — Part 35

The composition of the music, and the suiting the airs to the intended execution of a dance, is a point of which it is scarce needful to insist on the importance, from its being so obvious and so well known. Nothing can produce a more disagreeable discordance than a performer's dancing out of time. And here it may be observed, how much lies upon a dancer, in his being at once obliged to adapt his motions exactly to the music and to the character: which forms a double incumbence, neither point of which he can neglect, without falling into unpardonable errors.

A Treatise on the Art of Dancing — Part 35