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