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\end{equation}  where $\varrho_{min}$ and $\varrho_{max}$ stand for the minimum and maximum values of $\varrho$, respectively.  \paragraph{Global-best Harmony Search}  \label{ss.ghs}  The Global-best Harmony Search (GHS)~ employs the same modification proposed by IHS with respect to dynamic PAR values. However, it does not employ the concept of bandwidth, being Equation~\ref{eq:par} replaced by:  \begin{equation}  \label{eq:par3}  \hat{\phi}^j = \phi^z_{best},  \end{equation}  where $z\sim U(1,2,\ldots,N)$, and $\bm{\hat{\phi}_{best}}$ stands for the best harmony.  \section*{Acknowledgments}  The authors are grateful to FAPESP grants \#2013/20387-7 and \#2014/16250-9, as well as CNPq grants \#470571/2013-6 and \#306166/2014-3.