Susan, do you have the same problem as me? I can "play" songs in my head and hear an instrument (mandolin, guitar or voice for me) doing wonderful things; but when I pick up the mandolin and try to play what I've "heard", it just evaporates! I understand it's to do with pathways in the brain: the creative part makes up the arrangement and passes it to the hearing part, to which it's connected; but there's no connection to the hands, so you can't play it. (The same reason stammerers have no difficulty singing.) You have to remember what you "heard" and play it from that memory. I suppose you can train yourself to do this, but I'm not doing very well so far! I'd think that the training would establish the pathway in time. I need someone to teach me the technique!

Steve