If I had to choose a favorite song from the Beyonce & Jay Z show last week in SF, it would have to be the one song that neither of them had anything to do with. In fact, I don't think either of them were on stage for it. It was a mashup of Machine Gun by Portishead and Angels by The XX that was played toward the end of the show during the video dialogue. I liked the contrast of the two songs, so I did my best to recreate it here.
I do realize that these 2 songs have no business being together, so maybe they played it as a metaphor for their relationship. And to be honest I'm not sure it's worth ever listening to again after right now, so enjoy it while it lasts.