Song on a mug
 

For a while now I've been trying to identify a piece of music painted on a small mug that's evidently sold all around the world. Anyone got any ideas? :)


Here is the music played on a piano (with some basic improv in the left hand), uploaded to google drive (sorry, I dont have any youtube link):
0B_eNmfPnUImaRWFIeE0yTHllVkU

Thanks :)