Robert 'Bob' Milne is an American ragtime musician and concert pianist. Considered as a "very good specialist of ragtime boogie", he was referred to as a "national treasure" after he was interviewed and documented for future generations by the U.S. Library of Congress in 2004.
Experiments conducted by Penn State neuroscientist Kerstin Bettermann established that Milne has the unusual ability to mentally "play" up to 4 symphonies in his head simultaneously.