Wonderful old recordings...
While seeing the phenomenal Conrad Tao perform Rachmaninoff's Paganini Rhapsody with the Lubbock Symphony last week, I was inspired to find Rachmaninoff's own recording on YouTube (three parts; the link is to part 1). You've got to hear this, particularly his take on the famous 18th variation. The phrase, "with a twinkle in his eye" came to mind...