Barely Breathing by Duncan Sheik is featured in The Break-Up, the fourth episode of Season Four. It is sung by Blaine and Finn. Blaine sings this at McKinley while Finn sings at NYADA. They both sing this to express their sadness at the feeling of Kurt, for Blaine, and Rachel, for Finn, moving on with their lives and Blaine and Finn feeling like they're no longer a part of it.
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