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\paragraph{Global-best Harmony Search}  \label{ss.ghs}  The Global-best Harmony Search (GHS)~ (GHS)~\cite{Omran_2008}  employs the same modification proposed by IHS with respect to dynamic PAR $PAR$  values. However, it does not employ the concept of bandwidth, being Equation~\ref{eq:par} replaced by: \begin{equation}  \label{eq:par3}  x_{m+1,j} = x_{best,j},