Just now and again you come across something you've never seen on YouTube. This is a video with the Focus track Avondrood (Red evening). I'm not sure what the live at Top of the Pops tag means. I don't think this was ever on any British top of the pops.
Looking at the music of Dutch rock band Focus, started in the late sixties by Thijs Van Leer (b /31/03/48) with Jan Akkerman (b 24/12/46). Van Leer still performs and records under the name today (official site here). Akkerman's site here.