Influence. And sometimes that’s too much and sometimes a little is ok
I’m not a rock fan so as a music fan. As far as jazz, anything before the late fourties, is interesting to me.
http://www.google.com/search?q=improvisation+over+chord+changes
That’s an essential element of jazz borrowed by other musical styles.
Different styles, different tastes... it’s all good - and as American as apple pie.