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Cory Monteith

'Glee' finale: 10 memorable performances over the years

'Glee' finale: 10 memorable performances over the years

After six seasons, a live show and a concert film, Fox's "Glee" is finally switching off the lights in the practice room and calling it a day. The two-hour finale airs Friday with an episode co-written by series creators Ryan Murphy, Brad Falchuk and Ian Brennan.

Though ratings for the onetime phenomenon have dwindled from the lofty heights of its second season, chances are good that lots of alumni will tune in just to see what happens to everyone. This is a show about high school after all, and reunions are par for the course.

While we bide our time until we can all tweet about it together one last time, here's a look at some of the most memorable performances the...