found this on the internet.
Brian May guests on Spanish comedy show Tuneroloco. (it's stated to be 17-10-2003) He appears 2 times in the show and at the end, but this is the complete show. Quite funny!
156MB AVI-file
The show opens with the two hosts singing a version of WWRY.
Brian joins the two during a short funny act, later on in the show they thank him for being their guest. At the end of the show he returns during the end-credits. No songs, but hey, our Brian is on!