This weekend Sub-Pop Records celebrates 25 years of pushing the musical envelope. Signing and launching iconic bands like Nirvana, Soundgarden and Mudhoney, this label changed music forever in the early 90's.

Now celebrating an official 25 years their hometown of Seattle is throwing them a party all weekend. One of the highlights, and I don mean HIGH, was a concert on top of the Space Needle. And by on top of, I mean outside on the observation deck at the top of the gigantic tower. You might not want to watch this video if you're afraid of heights.