With these, who did not stop contented at the rude percussion and trumpet instruments, the next step was probably to cut reeds of various lengths and to discover that the length regulated the tone. Here was the first real discovery in music, for no sooner were high and deep tones known than pleasant alternations would suggest themselves, and as a consequence, melodies (however uncouth) sprang into being. Possibly at the same mystic era, the tension of the sinews of some animal, left exposed to the breeze, would fore-shadow string music. Then a thought was required to find that the sounds varied with tension of the sinews, and that a frame on which several threads and sinews were extended in different degrees of tension, could be made to give the same variety of tones, but of different quality of sound (_timbre_) from the reed pipes. This already made demands upon the inventive faculties, and in the infancy of music, as in the modern orchestra, stringed instruments take the lead.[189] It is improbable, however, that all nations went the same road in these discoveries. Accident had much to do with it. The conch shell, among a tribe near the sea, the horn, with a hunting people, and, with people situated near the bamboo forests, the “pans pipes,” would be the first of instruments. Instruments of the order of flutes, were also of easy fabrication, and the knowledge that they are so wide-spread among savages all the world over, is internal evidence that they were “natural” instruments. Without sketching further the probable progress of musical invention, we shall now describe some of the instruments and songs used by the people of the world who are yet in a state of nature. But first let us mention some instruments, which have been handed down to us from an immensely remote and ante-civilized period. The antiquarians in classifying the progress of pre-historic races from their earliest emergence from barbarism, have called that age, when the use of metal became first known,—the Bronze Age; as at that time smelting not being known, the use of iron was not understood, and metal implements were fashioned of copper, which could be beaten by the hammer (of stone) into the required shape, even when cold. Of this mysterious epoch, a most interesting relic has been discovered, in the shape of a musical instrument. In a sepulchre, in a deep ravine, in Schleswig, were found very recently, a number of ornaments of bronze and gold (silver as well as iron, was not then used), and also the horns of many oxen. In the midst of this, lay a very large _trumpet_ of bronze; a sure token of the existence of manufactured musical instruments, thousands of years ago. This unique instrument when blown, gives forth a deep, grave, and sonorous tone. In common with all the barbarian trumpets, it has but one tone. It is at present in the Museum of Copenhagen, but was exhibited at the Paris Exposition of 1867.[190]