Someone told me about this in 2009. I do not know if it is just a rumor. We were in a piano bar in the old town in Zuerich. I did not know them but they were serious people who lead interesting enough lives not to have to make up stories. Although now I see Daily Mail I am beginning to doubt. He said they are all huge, same in size but hard to work and that there was a 'mother' one which was enormous. His friend sang 'Simply the Best' for Putin. Is it true?