I do this with both kids. I used to do it every single night for years. Got out of the habit when eldest was doing good on his own. Recently start back up habit. Bonding, learning, winding down, imagination.
This is what I love to do. Right here. Just sit in a pile of blankets and read music books. To lay there and imagine the song's sound, how much effort it takes to make it perfect and what I would do to improve it. :) *sigh*