He has 30 minutes shared teaching at school, but this is supplemented 5 times a week by his father, who is a musician. Ex uses the same book that the teacher uses with him. While ds is keen, and seems to do well within each 'lesson', he seems to have no memory of what he has done when it comes to the next session. He does a lot of guessing and does not seem to be learning the notes etc.
He has been learning since September, so surely some of it should be 'sticking' by now? He is doing well at school and doesn't usually struggle to learn new things, though concentration/ interest in the subject can vary. However, he does seem keen to do this so not sure that that is the problem.
Any tips would be great.