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\subsection{Harmony Search}  \label{ss.hs}  Harmony Search (HS) is a meta-heuristic algorithm inspired in the improvisation process of music players. Musicians often improvise the pitches of their instruments searching for a perfect state of harmony~\cite{2009}. The main idea is to use a similar process to the one adopted by musicians when creating new songs, where each possible solution is modeled as a harmony (agent), and each musician corresponds to one decision variable.  \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.