For two decades, when John Rzeznik needed to write a song, the frontman for alternative rock outfit Goo Goo Dolls would lock himself in a room to write alone. That method turned out indisputable hits of the '90s and 2000s like "Name," "Slide," "Let Love In" and, of course, "Iris." But after 10 albums, some personnel (and personal) changes and a band coming up on 30 years together, the process had begun to get a bit depressing, he admits."You can't create in a vacuum, you know? You can't learn in a vacuum. You can't grow in a vacuum. Exposure to people who have different skills and different wo