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\begin{equation}  \label{eq:par3}  \hat{\phi}^j x_{m+1,j}  = \phi^z_{best}, x_{best,j},  \end{equation}  where $z\sim U(1,2,\ldots,N)$, U(1,2,\ldots,n)$,  and $\bm{\hat{\phi}_{best}}$ $best$  stands for the index of 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.