I don't think you can replaces great themes. But I think people do want to hear fresh arrangements of them. They don't want to hear them played the same way all the time.
“The human mind, if it is to keep its sanity, must maintain the nicest balance between unity and plurality.”
“People should realize that I shot a Coke commercial back in 1986. So, you know, I've been around a long time. I carry my Screen Actors Guild Card.”