Rachmaninov so I can make him smile 
Ah, but Rachmaninov smiled all the time - it's just that he didn't do it in public!
When he began to make piano rolls for Ampico, they gave him an Ampico piano for use at home, and he apparently fell hook, line and sinker for the popular dance arrangements of the day. He would sometimes call in at the studios, so the story goes, and chat to the young musical arrangers, congratulating them on their ingenuity and counterpoint, and encouraging them to do more. It's rather fun to think that Rachmaninov had a significant influence on dance music of the 1920s - someone should do a thesis one day.
Henrah, have you heard his performance of his arrangement of Kreisler's "Liebesfreud"? It is so witty and mischievous! I ought not to post it here, because I only have recordings that are subject to mechanical copyright. But I could email it to you personally without breaking the law, couldn't I, if you want to send me your email address via a PM?