Thanks ... I assume you would permit a few little mistakes, as long as they are not permitted to interrupt the flow of the music. Let's negotiate... how about a maximum of one mistake every three bars?I realize that may sound silly to you but I have had very little experience of piano lessons in my life. I had a Russian moscow-conservatory teacher once but his idea of teaching an adult beginner was to start immediately with things like Rachmaninoff's famous Prelude, Chopin's Harp etude, and one of Bach's French Suites.... I suppose on the assumption that since I was already an accomplished player of several other instruments, I wouldn't want to waste time on childrens' fundamentals ... funnily enough after a couple of months I was actually able to stagger through those pieces. Then I stopped piano for many years. Now I'm starting from baby steps and I don't mind at all playing baby repertoire, it makes me feel secure.