Okay, yes, I listened to the fifth one, a bad recording, but it still sounded beautiful. I do think it's a lot musically harder than the third one, like you say. Despite all the suggestions I think I'm going to start with the third one and then move on to one of the others. The rest seems so technically difficult and such a lot of work. And I would like to play Chopin's octave etude before attempting the sixth, although it's a lot simpler than it seems.