Dancers' shadows on the speakers. &quot;Os Sedutores&quot;, a boys' band from  Jacare, a favela  in Rio's North area, are performing at the &quot;baile&quot; of  the favela Boca do Mato. For those boys' bands, to enter the Funk scene represents an opportunity to get a living and win the esteem of tens of thousands of &quot;funkeiros&quot;, to succeed beyond the fatality of drug trafficking or miserable wages.