From 1968, here are two performances of "Revolution" filmed one after the other and edited side-by-side. Filmed at the BBC tv show "David Frost", one version was made in PAL format (for the UK) and the other version was NTSC (for the US). When I used to watch this "video" I would notice that it wasn't quite the same as the last time I watched it. After some research, I found out there was in fact 2 different performance videos. This video is edited together using copyrighted music and/or video from various sources. Use of these materials to produce this video is allowable under the "fair use" provision of U.S. Copyright law. .