I think generally playing live is a crap idea. So much of stage work is the presentation of personality, and I've never been interested in that.
The way 'Lux' was made is that there are 12 sections in here, though two of them are joined together. So there are really 11 sections, in a sense, and each one uses five notes out of a palette of seven notes, and my palette is all the white notes on the piano. That was the original palette.
I'm not interested in possible complexities. I regard song structure as a graph paper.
Zappa was very technical and impressed by things that were musically challenging - weird time signatures, strange keys, awkward chord sequences. Zappa was important to me as an example of everything I didn't want to do. I'm very grateful to him, actually.