Song by Britney Spears sung by Heather Morris(Brittany)
Sung by Tina, Sam and Joe for Britney week

Glee 4x02 "3"
Americano by Lady Gaga and Dance Again Jennifer Lopez sung by Cassandra July(Kate Hudson)

Glee 4x01-Americano/Dance Again
Performed by Blaine and Artie to cheer up Britney

Glee 4x02 Boys/Boyfriend
song by Justin Bieber sung by Kevin McHale(Artie) and Darren Criss(Blaine)

Glee 4x02 Boys/Boyfriend
Carly Rae Jepsen song Sung by Jenna Ushkowitz, Darren Criss, Alex Newell,and Kevin McHale

Glee 4 x01 Call Me Maybe
Jake and Marley sing Britney song

"Crazy"/"U Drive Me Crazy" -Britney 2.0 4x02
Lea Michele and Dean Geyer sing "A Change Will Do You Good" in the "Makeover " Episode

Episode 4x03 "A Change Will Do You Good"
Marley and Unique try out for Grease wanting the role of Sandy and Rizzo

Episode 4x05 "Blow Me One Last Kiss"
Marley sings after Jake breaks her heart

Everytime-Britney 2.0 4x02
New Directions put on a show for pep assembly that mimic Britney Spears breakdown at the VMA's

Gimme More-Britney 2.0 4x02
Song by Britney Spears sung by Heather Morris(Brittany)

Glee 4x 02 Gimme More
Jake(Jacob Artist) tries out for Glee club with Justin Bieber 'Never Say Never'

Glee 4x01 ",Never Say Never"
Marley (Melissa Benoist) and Rachel(Lea Michele) sing a duet

Glee 4x01 "New York State of Mind"

Heather Morris and Chord Overstreet sing "Celebrity Skin in "Makeover" as Brittany vies again for Class President.

Glee 4x03 "Celebrity Skin"
Darren Criss sings Everybody Wants to Rule the World as he considers running for Student Class President in "Makeover"

Glee- 4x03 "Everybody Wants to Rule the World"
Lea Michele, Sarah Jessica Parker, Chris Colfer sing "The Way You Look Tonight" in "Makeover"

Glee 4x03 "The Way That You Look Tonight"
Who's the best Danny and Sandy? Marley,Ryder,Kitty, and Danny try out for the leads in "Grease"

Glee 4x05 "Born to Hand Jive" -Grease
Jake(Jacob Artist) and Kitty(Becca Tobin) tries out for Danny and Sandy

Glee 4x05 "Everybody Talks" Jake and Kitty
Blaine (Darren Criss) sings because he misses Kurt

Glee 4x05 "Hopelessly Devoted to You"
Glee,The Role You Were Born to Play"Juke Box Hero" by Foreigner sung by Finn(Cory Monteith) and Ryder(Blake Jenner)

Glee 4x05 "Juke Box Hero"-Ryder,Finn
Blaine sings to Sugar(Frenchie) "Beauty School Drop Out"

Glee 4x06 Glease "Beauty School Dropout"
Glee's guys perform Greased Lightning

Glee 4x06 Glease -Greased Lightning
"There Are Worse Things I Could Do" sung by Santana,Cassandra,Unique"

Glee 4x06 Glease "There Are Worse Things I Could

Glee's performance of Grease

Glee 4x06 Glease"Your the One That I Want"
The Unholy Trio sing Motown with Come and See About me

Glee 4x09 Thanksgiving -Come and See About Me
New Directions perform "Gangnam Style" at Sectionals

Glee 4x09 Thanksgiving -Gangnam Style
The graduates return home to help New Directions prepare for Sectionals

Glee 4x09 Thanksgiving-Home/Homeward Bound
Performed by Sarah Jessica Parker,Chris Colfer,and Lea Michele

Glee 4x09 Thanksgiving-Let's Have a Kiki
The Warblers perform One Direction hit at Sectionals

Glee 4x09 Thanksgiving-Live While We're Young
"Whistle " performed by the Warblers at Sectionals

Glee 4x09 Thanksgiving-Whistle
Sung by Brittany,Wade,Blaine,and Tina vying to be the leader of New Directions!

Glee 4x01 Call Me Maybe-"The New Rachel"
Adele's Chasing Pavements sung by Marley Rose(Melissa Benoist) as she joins New Directions

Glee 4x01 "Chasing Pavements"
Blaine(Darren Criss) sings "It's Time" to Kurt(Chris Colfer) encouraging him to move to NYC

Glee 4x01"It's Time"

Santana sings to Brittany as she breaks up with her

Glee -The Break Up -Mine 4x04
Brittany sings as she is hurting over missing Santana

Hold It Against Me-Britney2.0 4x02
by Imagine Dragon sung by Darren Criss(Blaine)

Glee 4 x01-It's Time
Rachel shows Cassandra that she is sexy to dance the Tango in dance class

Glee 4x02 Oops I Did It Again
Sung by Finn,Rachel,Klaine and Kurt when they find out each other had a brief encounter with someone else

The Break -Up : "Don't Speak" 4x04
Brody and Rachel sing a duet as Finn watches and sees Rachel's transformation and thriving in NYC

The Break-Up "Give Your Heart a Break" 4x04
Blaine sings to Kurt at his visit at NYADA students local hangout knowing he has cheated on Kurt.

The Break -Up "Teenage Dream -Acoustic 4x04
All the Glee couple sing The Scientist by Cold Play on the stage at McKinley

The Break Up "The Scientist" 4x04
The girls follow Jake Puckerman around and call him a womanizer

Womanizer -Britney 2.0 4x02