This is from a video game called BioShock Infinite. Long story short, time portals open to different places in history. In this particular picture, it looks like a time portal is revealing a band of some sort. They seem to be some kind of European military band to me judging by their uniform but I'm not sure. Can anybody tell me which time period this band is from?
Note that they aren't actually greyish in colour. The portal just depicts them in that way.