Thundering across the desert wilderness came the savage band of Tuaregs-veiled warrior horsemen. Suddenly their mounts faltered, shied and pulled up, to stand trembling. Amazed, the Tuaregs cocked their rifles and looked around for signs of an enemy. Nothing! Then, from beyond a high ridge ahead came again the strange, unearthly sound that had frightened their mounts. A kind of music, it seemed to be.

They dismounted and crept over to the edge of the bowl-shaped depression. One by one their heads came up, until the hollow was ringed with them. Every Arab was pop-eyed at what he saw down there!