The Glee Club is "so emotional" over the loss of Whitney Houston and getting ready to say goodbye to their high school years, so leave it to Mr. Schue to assign a project. 
That's right, it's an electrifying tribute to the legendary Whitney Houston, and it starts strong with the opening performance of "How Will I Know" … a goose-bump-inducing number which leads Kevin and Jenna to wonder why Amber didn't get any solos this episode. 
Plus, the song Kevin hated doing at the time, the scoop on the scene added to perhaps squash off-camera rumors, and the song they only had minutes to learn before shooting, so they hid the lyrics behind Jenna's back. Literally! See omnystudio.com/listener for privacy information.