The YouTube comment on this clip states simply:
Maple leaft Rag, recorded on Pianola Roll actually played by Scott JoplinI first heard this Joplin classic at a college friend's home decades ago. After dinner, he sat down at the family pump organ and played the heck out of this tune.
The tune's ability to blow me away remains undiminished. Hearing it from its author's own hands is an even greater treat. I'm going to smile a lot more today.
(via kung fu grippe)