The morning after seeing Toronto’s Metric, I had a brief water-cooler conversation with a co-worker who had caught the band the last time they rolled through town. “I’ve always been surprised how quickly that band blew up,” he said. “It seems like they got huge almost overnight.” I nodded in agreement, having seen them fill a 1,200-capacity club the night prior. After giving the matter some thought, however, I realized that Metric’s rise to the…