Classical music is getting the cool kid makeover this Saturday. And they call it “Fringe”. A mixed media concert series in its second successful season, Fringe has been getting plenty of buzz, selling out shows, and redefining what people think of classical concerts in Atlanta. And the word is spreading fast. This weekend’s edition features pianist Brandt Fredriksen, cellist Erin Breene, violist Tania Clements, double-bassist Emory Clements and violinist Fia Mancini Durrett.