I agree, Rikki, with your statement, with the operative phrase being "to fill out your performance". I will use backing tracks, occasionally, for background support only. I play with an active left hand and right hand melody and/or sing. In contrast, I see performances by many groups where guitar, accordion, and keyboard players pretend to play, that any musician, especially, can spot. Last night, I was watching a show that included an accordion player running her hand up and down the keys with the bellows closed, or keyboard playing a difficult part with his hands barely moving. This blatant pretense makes me ill. I may as well try to ignore it, as everyone, it seems, is doing it. When I think of the countless hours of learning and practice true musicians, like ourselves, have invested, I begin to lose faith in society.