Does anyone have a link to the 'Original Song' song episode?

You can watch it on the cucirca website. Here's the link:

link

I watched all of Season Two in a few days using this website called tvblinkx. Search "Glee blinkx" and it should be near the top, also if they don't have anything good, just search the name of the episode and then "full episode" on google, you'll find a decent site eventually. Also, with almost all the free-online sites, you will get pop-up adds. Don't freak out, most of them are harmless, just exit them off before they make sound.

link
You can watch all the episodes here from Seasons 1 & 2 for free and survey/ad crap free . :)