I've no idea. For me the most important change is the infiltration of influences from outside North American - from Africa, South America, the Arab world. Stylistically jazz has been influenced by electronic technology. There are so many styles. Not so much musicians but jazz fans are very conservative in their view as to what jazz is.
Musicians are far more eclectic.
But, I don't consciously choose from different fields. What ever I have heard is stored in my emotional data-bank. Ella, Sarah in the past and now, I think, Dianne Reeves. I don't think so really, although we are all influenced in some way. I think the credibility of a singer like Ella Fitzgerald was important for me.