Put together by music-industry biggies Gary Kurfirst (Talking Heads, Jane’s Addiction, the Ramones) and Chris Blackwell (Bob Marley, U2), Musica Fresca is a Latin-fusion showcase with Akwid (hip-hop), Yerba Buena (Latin funk), Voltio (reggaet—n) and Santana faves Radio Mundial (Latin rock). The biggest draw on the bill is Akwid, made…