Thanks j_menz, but after looking at the BWV 841 minuet it's not the same one, even though it does begin with three D's in the treble! There are two other mystery minuets in this book that I can't identify, both in G minor. I'm attaching pictures of the first page of each. If anyone can help I would be hugely grateful.
Thank you so much! I actually had searched for it on YouTube but didn't come up with anything naming the piece specifically.
Is this book standard exam repertoire? I didn't know.
And I will have to write a post asking about this exam system everyone talks about. Unless I'm mistaken there's nothing like it in the US.