Jazz is smooth and cool. Jazz is rage. Jazz flows like water. Jazz never seems to begin or end. Jazz isn't methodical, but jazz isn't messy either. Jazz is a conversation, a give and take. Jazz is the connection and communication between musicians. Jazz is abandon.
Life is a lot like jazz... it's best when you improvise.
Most of what I listen to now is mainstream jazz from 1935 right up to and including early bebop and cool jazz.