This is one of my favourite slower works by Rachmaninoff. I first learned it way back in my university days and played it at a few concerts. Recently, I relearned it to share with my students for our annual Christmas recital. Its main theme is so beautiful, especially when Rachmaninoff adds the sparkling descant figure in the top voice on the second page. I love the fullness of the return to the A section; it could almost be part of a slow movement from one of his concertos.