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10) ''Imagine'' performance, ''Hairography''
Few musical moments in Glee have been more touching than this: The kids joined forces with their competition, a deaf choir, to cover John Lennon's classic. This series can be delightfully sarcastic, but ''Imagine'' was aimed straight at the heart (and the tear ducts).
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9) Will finds out Terri isn't pregnant, ''Mattress''
Terri's fake pregnancy was undoubtedly the most polarizing story for the first half of Glee's season. So, when Will (Matthew Morrison) finally discovered his wife's fake baby bump in a drawer, it earned a sigh of relief from Terri-haters all across the country.
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8) Finn tells his mom about Quinn's pregnancy, ''Ballad''
After his mother caught him singing ''I'll Stand By You'' to his laptop, Finn (Cory Monteith) had to deliver the tough news that his girlfriend was pregnant — and the tears flowed for both parent and son. A surprisingly tender moment for the usually stoic jock.
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7) ''Defying Gravity'' performance, ''Wheels''
The glee club's first ''diva-off'' was a true battle between Rachel (Lea Michele) and Kurt (Chris Colfer) for the right to take lead on Wicked's famous track. But the real emotion of the scene came from Kurt's own struggle to come to terms with his sexuality and identity. We dare you to watch and not get chills.
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6) ''Hate on Me'' performance, ''Throwdown''
The best use of choreography so far, particularly by Mike (Harry Shum Jr.) and Matt (Dijon Talton), and a great showcase for the astounding vocals of Mercedes (Amber Riley). It got bonus points for Kurt's hilariously ludicrous angora sweater.
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5) ''Maybe This Time'' performance, ''The Rhodes Not Taken''
Glee club alumna April Rhodes (Kristin Chenoweth) returned to the school, then shared a duet with Rachel on this classic from Cabaret. The bluesy track perfectly encompasses April's somewhat sad struggle to recapture her old glory.
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4) Kurt comes out to his father, ''Preggers''
Arguably the strongest and most emotionally piercing plotline is Kurt's relationship with his father, played perfectly by Mike O'Malley. Kurt's coming out was even more impressive and affective for its delicacy in a series known for over-the-top theatricality.
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3) Josh Groban's cameo, ''Acafellas''
One of the most enjoyable surprises was Groban's self-effacing cameo playing himself. Best was his attempt to woo Will's inebriated mom: ''Josh Groban loves a blousy alcoholic.''
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2) ''Push It'' performance, ''Showmance''
For shear comedic delight, no other performance has approached the broad joy of ''Push It.'' The highlight was the school audience's respective delight (Principal Figgins) and horror (Sue).
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1) ''Don't Stop Believin'' performance, Pilot
It aired way back on May 19, but who can forget this iconic moment in Glee history? This was the performance that sent shivers down Gleek spines everywhere and went on to become an iTunes phenomenon.