You couldn't turn on a radio in the '90s without hearing a Goo Goo Dolls song.The alternative rock band, fronted by lead singer John Rzeznik, was king of the charts with singles such as "Name," "Slide" and "Iris," the latter of which spent 18 weeks at No. 1 on Billboard's Hot 100 chart. Since 1986, they've released 11 albums and sold more than 10 million records. They'll perform Saturday at Pikes Peak Center.Rzeznik is grateful for the band's staying power, but also believes it's an aberration. "It feels like we're hanging on by a thread," he says. "I think that the generation of musicians we