Boy, boy, crazy boy.

This past week, the kids at McKinley High tried out for roles in "West Side Story." Mike Chang (Harry Shum Jr.) won the part of Riff with his rendition of the musical's "Cool." Go behind the scenes in this video with Harry and "Glee" choreographers Zach Woodlee and Brooke Lipton to see how it all came together.

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- Lori Wilson