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Nick Pitera's ''Don't Stop Believin'''
Switching between male and female voices, Nick Pitera amazingly sings Glee's showpiece all by himself.
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FLASH MOB IN ROME
Teens suddenly begin dancing to ''Don't Stop Believin''' for a promo in an Italian shopping mall.
See the ''Flash Mob in Rome'' clip.
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PUCK'S PERSONAL TRIBUTE
Actor Mark Salling sings his own song about ''chillin' on Glee'' — with backstage footage!
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''SINGLE LADIES'' PEP RALLY
An actual high school football team re-enacts the on-the-field scene. Sloppy, yes, but still very funny.
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Favorites from the show get their vocals tweaked to hilarious effect to sound like Alvin & Co.
See the ''Chipmunked'' Glee clip.
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YouTube singin' star Sam Tsui covers ''Don't Stop Believin''' — and edits the video so that there are five Sam Tsuis performing onstage together. (Guess the world isn't so lonely for this small-town boy.)
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MULTIPLE PERSONALITIES: TAKE TWO
Part of an Internet parody series known as ''Electric Spoofaloo,'' this one features a single actor playing every role in the series. It picks up speed toward the end when the ''cast'' performs ''Hot-Crossed Buns.''
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Manny Garcia (another singing star in the YouTube firmament) does a mash-up tribute of ''True Colors/Defying Gravity'' (both of which have been featured on Glee) — and he seamlessly combines them into one epic ballad.