Don't groan, but I think the word "postmodernism," nicely covers what's going on in our times in all the arts, whether it be pop, jazz, film, dress, literature, architecture or whatever. No longer do we have the avant garde striving for something new which will outdate the last thing (consider the career of John Coltrane); now it's a case of making new things by delving into the rich selection which the past offers us (consider Alan Barnes's music). Academic analysis of past forms (in the case of the popular arts largely ignored by academia formerly) is also part of the phenomenon and currently under discussion in another thread in relation to jazz.