The funny thing about this is that music has hit the wall several times. The outcome is what we call "genre". Rock has the basic three major chords with a minor tossed in every now and then. Jazz has predictable turn arounds. Country and Blues works much the same as Rock does.

I think the framework sets the boundaries. However, artistry often happens as writer seeks to navigate their way towards either sounding like the rest out there or opening a hybrid of various combinations.

With that in mind, music has reached its limit. But, the innobvative minds that can create with those limits has not reached its limit.

What I try to do when I write is to take conventions that are familiar and insert little oddities to throw someone off into thinking that they got my flow. That can be with the instrument voicings, melodies, counter/complimentary harmonies, or chordal arrangements.

Cheers!
RickeG