The lead singer of Boston died a bit ago and for the tribute concert for him the Boston guys got Michael Sweet of Stryper to sing for the concert.  Apparently they really liked it cause now he's going on tour as their singer. 

Here's a VH1 concert with a couple Boston guys with Stryper.  The first few "take a look ahead" parts are a bit rough, but whatever, you get the idea.  The first real concert I went to was a Stryper concert in 9th grade.  I got a Tim Gains pick, which I still have.  I also have a Stryper Bible.  Which of course makes me the best Christian around.