You know him as the teacher from Glee, but this summer Matthew Morrison has stepped out of the classroom and onto the stage, opening for NKOTBBB (New Kids on the Block and Backstreet Boys).In the spring, he released a self-titled album, featuring duets with Elton John (a Mona Lisas and Mad Hatters/Rocket Man mash-up), Sting (Let Your Soul Be Your Pilot), and Gwyneth Paltrow (Somewhere Over the Rainbow). The Globe caught up with Morrison in Vancouver, early in the tour.Do you ever think, pinch me