The southpaw edge?

Left-handed pianists – from Vladimir Horowitz and Arthur Rubinstein to Richard Goode and Leif Ove Andsnes – may have an inherent advantage over right-handers. "All piano students must overcome the two hands’ resistance to work separately; by having to work harder on what’s essentially a right-handed instrument, the neurons of left-handed pianists get an extra workout and thus grow stronger," Pierre Ruhe writes in the Atlanta Journal-Constitution:

http://www.ajc.com/services/content/printedition/2009/01/04/lefty.html