I don't think it has all been played yet at all.

Part of the continuous process is that a music development must first be recognizable by the public, and that can take time.

For example, a lot of the changes and even chords that are common today were not in common use a few hundred years ago, sometimes for reasons of the technology, for example, the Just Intonation was not able to sound many of these chords properly such that they sound cacaphonous, that had to wait until the Tempered Scale came into use by the majority, in other cases, the human ear development as to what was acceptable just wasn't there, as in the case of the Tritone, which is hiding in every dominant 7th chord.

The Blues had to wait until the people could digest the Blues Chord. etc.

There is still a lot of music out there somewhere.


--Mac