Goo Goo Dolls mark 25 years with July 4 concert in Philly; CD that probes country's strugglesGoo Goo Dolls singer Johnny Rzeznik says that when his band was approached with the idea of playing a free Fourth of July concert — billed as the nation's largest — on Philadelphia's Benjamin Franklin Parkway, they jumped at it."I was like, 'Yes, of course!' " Rzeznik says, laughing, in a recent phone interview. "I mean, come on, man, that's like once-in-a-lifetime chance. You get to play in Philly in front of a huge crowd downtown, Fourth of July. I mean, that's pretty damned American."So the Goo Goo