If you aren't familiar with OK Go, you've clearly been living under a rock. (If you need a memory jog, they did that cool synchronized treadmill dance in the video for "There it Goes Again") These guys not only produce some great, energetic music, but their videos are always worth watching. Insanely creative and usually band-produced, I haven't seen one yet that I didn't like. Their newest one, an alternate video for "This Too Shall Pass", tops even the treadmill dance. The band created and built the entire machine! Check it out: