Who is the famous musician who played piano using only the black keys?

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Irving Berlin Berlin never really learned to play the piano. In fact, over his entire life, he ultimately could only play in one key, F sharp, essentially only black keys. Later, he had a device attached to his piano that would allow him to transpose other keys to his favored one. http://parlorsongs.com/bios/berlin/iberlin.php [Link and text added -- Zb] Apr 01 01, 5:56 AM