If you do a Google search using the phrase in question + the group's full name, you'll get lots of hits. I had a glance at some, hoping to direct you to a specific piece that explains, but it seems no-one is too clear about its significance, though it might refer to a song by someone else. It seems also that one meaning of 'bridge' in musical terms is a passage of music which links two separate parts of a composition. As you're probably a fan, perhaps you'll show more persistence than I was prepared to! Good luck!