I've watched many performance videos, but this definitely counts among those that have hit me the hardest. I could watch it over and over again, and it would still be as beautiful as the first time I pressed "play." The video highlights the unforgettable performance of Andrea Bocelli and Katharine McPhee singing "The Prayer" at the Mandalay Bay Hotel in Las Vegas in 2008. The clip alone is powerful enough that it gives me goosebumps; I can't imagine what it was like to actually have been there in person. You can tell from the video just how deeply entranced the audience was by the captivating performance.