The entire cast of Glee came together and sang "One" during the 5/11/10 episode of Glee. It was a great rendition and you can listen to it here.
Added:
Mercedes and Santana teamed up for "The Boy is Mine" on the 5/11/10 episode of Glee. Listen to this audio version of the single and, simply put, enjoy.
Added:
Listen to Kurt's version of "Rose's Turn" in this 30-second video. It's a snippet of one of the singles played and heard on "Laryngitis."
Added:
Enjoy this 30-second snippet of "Lady is a Tramp." Puck and Mercedes put on the song during the great Glee episode, "Laryngitis."
Added:
Finn does a cover of "Jessie's Girl" on the Glee episode "Laryngitis." What did you think of this rendition of such a classic?
Added:
Uh-oh. Puck has lost his edge on the Glee episode "Laryngitis." How will he get it back? By dating Mercedes, of course!
Added:
Say it isn't so! Rachel fails to sing a Miley Cyrus song well in this clip from Glee because the talented diva has lost her voice. What will she do?!?
Added:
Rachel Berry with no voice?!? That nightmare befalls our favorite character on next week's episode of Glee. Watch a preview now for "Laryngitis."
Added:

Glee Quotes

I'm gonna miss all of you. I love you guys.

Puck

Blaine: We don't lip sync in Glee
Brittany: My voice is too weak to sing live. I've been up every night this week yelling at the shrubs in my yard that have been making fun of me.