Eddie and Scott:

What I recall reading is that Berlin played only in the key of C, but this doesn't imply that he didn't use any black keys. He would have used accidentals as required to fit the melody/harmony.

The sheet music I have for White Christmas is in C, but the word "of" in "I'm dreaming of . ." has to be D#.

I think I also recall reading that he had a piano on which the keys would shift so that even if he was playing the C major keys, he could shift it so that the music coming out was in E flat for example.

Never mind, Errol Garner couldn't read music in any key.

Glenn