The Giants knew they'd be changing themood around AT&T Park when they scheduled Bill Walton,surviving members of the Grateful Dead and that honey-smoothcrooner, Tim Flannery, for a pregame bash. What remarkable goodfortune that it landed on Tuesday night's game. This team needed change - of any kind - in the worst way. Youwouldn't think music has anything to do with a crisp slider or ashot into the right-field arcade, but in a world often governed bysuperstition, the Giants gladly will credit thattrippy mini-concert for their 6-0 victory over the PittsburghPirates.