Highly reliable harmony search algorithm

In this paper, after a literature overview, studies will be concentrated on pitch adjustment ratio function of harmony search algorithm. A more rational function will be proposed which increase the robustness of algorithm and therefore leads to a highly reliable algorithm simulations on a set of standard TSP problems, demonstrates that parameter of reliability (variance over average), has experienced 75% of improvement. Cost paid for this considerable improvement, is completely negligible; 0.7% decrease in quality of responses.