By Anjum Altaf In the last installment we went back to the origins of instrumental music tracing it to the sound that resulted from the draw and release of a hunting bow. This was presumed to have led to experimentation with more strings being stretched across a bow-like frame – a precursor of the harp. Since the shape of the frame mandated strings of unequal length, we asked the natural question: Did there need to be any kind of relationship between the lengths of the various strings in order for the harp to produce music rather than noise? Recall from an earlier istallment that the frequency generated when a string stretched between two points is plucked depends upon at least four characteristics of the string: its material, its thickness (or gauge), the tension with which it is stretched, and its length. These can be easily verified by actual or imaginary experiments.