Funny that Oscar Peterson was brought up. Here's a link to a YouTube video where Peterson talks with André Previn about exactly this: the use of the left hand by pianist, and the difference in usage of that left hand when playing solo or in a band:
http://www.youtube.com/watch?v=55wYm8csHC4

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- THE DUTCH KEYBOARD FORUM
http://www.keyboardforum.nl
Happy owner of a Roland E-80 V2
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- THE DUTCH KEYBOARD FORUM
http://www.keyboardforum.nl
Happy owner of a Roland E-80 V2