Glee creator and head writer, Ryan Murphy told Inquirer that they're writing into the show a song that's a "big hit" and implied that it may end up being in the form of a mashup:
"We’re writing an episode where we’re doing the 'Gangnam Style,' the big hit. I’m trying to figure out how I am going to mash up with that and make it our own."
Yes, it's that Korean rap you've probably heard. At least, I hope you've heard it because I have - and I don't want to be the only weird one out there. You know, other than Mr. Ryan Murphy & Co. ;) You can check out the video here.
It definitely seems like a good pop culture fit for Glee, which character(s) on the show should do the honor of singing Gangnam Style?