This is a 10 minute video of Stairway to Heaven, performed by none other than Led Zeppelin in 1971. The quality is pretty good. It's also would you might call, the extended version, because Page has like another minute and a half of solos:). Enjoy!

I can't link it directly to the video, but the thing is on google video. So I'll link you guys to the googe page, and Stairway to Heaven is the one on the top row in the middle, it says "Led Zeppelin Live: Stairway to Heaven"

http://video.google.com/videosearch?q=stairway+to+heaven&page=2&lv=0&so=0