Your browser does not support iframes. SAN FRANCISCO — It is written in some holy texts that when folk music legend the Kingston Trio, Metallica frontman James Hetfield and rap star Lil Wayne converge on the home ballpark of the San Francisco Giants in October of 2012, the apocalypse soon will follow. And look at this: We got Game 7 of the NLCS coming up Monday night, with the Giants taking on the St. Louis Cardinals for a World Series berth. It might not be the end of the world, but it should be pretty crazy-go-nuts around AT&T Park. Rain permitting. But in Game 6, the Giants took pains to ensure that all sorts of musical tastes were represented at the McCovey Cove Center for the Performing Arts. The current version of The Trio sang "The Star Spangled Banner," and Hetfield gave a rousing pep talk that Hunter Pence would have loved. It included the the following question: "Are you ready to kick some Cardinals ass?!" (It turns out the Giants were ready.) And then there was Dwayne Michael Carter Jr., who had given a Twitter shout-out to Theriot after the Giants won Game 5 in St. Louis on Friday: Props to my homie Ryan Theriot and the Giants!! 2 mo!Great game Zito! — Lil...