Air date: September 16, 2009

Synopsis:

Will forms the Acafellas, an all-male a cappella vocal group, and spends more time building his own confidence than he does with the glee club. In Will’s absence, the glee club decides to hire a well-known choreographer to help coach them to Nationals. Meanwhile, Mercedes is bitten by the love bug, but her feelings aren’t reciprocated. When the Acafellas perform for the PTA, they get a surprise visit backstage from Josh Groban. Kurt admits to Mercedes that he is gay.

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Sources: TV.com, Wikipedia