Nope not Cat Stevens (although if anyone looks like he did here, phone number would be lovely) The guy on the hammond he looks aces, were there many blokes around with his funky style, amazing barnet and nice afghan thing around circa 1976?
I don't think its the external link that is at issue sue de Nym, it is not a link to objectional material, its the legality of whoever uploaded that video. I am not sure but I expect they asked the owners position