Really? Sorry, but all this German made me a bit sceptical.
At this point the boys had only three singles in the German charts ("Fun, Fun, Fun" #49 - "I Get Around" #38 & "Little Honda" #44). But in April, Today!-Album made it to #14, followed by their top 10 debut with "Help Me, Rhonda". So the promotion machine was started around that time.
Do you know if they filmed portions of the concert or just interviews and backstage stuff? And was it done for TV?
A very intersting document for sure. There seems to be miles of BB footage lying around in TV archives, unfortunately they often don't know how important that material is.