One of the themes of this website and ACS is to combine "ethnic music" with "computer music". The image of ethnic music and computer music is "old music" and "new music". However,  as I add composing function of ethnic music to ACS, I noticed that these two have common feature of  "ad-lib".  Both of them play and generate sounds on the spot by following  a certain rule. For instance, in popular music and classical music,  what you call "composing a tune" or "playing a tune" would take place. However, in some ethnic music, this is different. For example, in Indian music, I think that they rather "play according to the given rule" than "play the given music". And I think this set of rules decides each style of ethnic music. To be more specific, what I call rules are "musical scale", "rhythm", and so on. Let us take Okinawa music of Japan for example. If you play a tune according to Okinawan scale and rhythm, your tune will sound just like Okinawa music. As mentioned above, although there is a difference that computer does the performance or man does it,  I think that there are common features in automated composing and performance of ethnic music. In addition, the situation is different for jazz. Like ethnic music, "Ad-lib" is being valued though there is some melody for jazz. However, as for jazz , I feel that players make the style. As you are aware, if the player is different from the one you know, the same tune can be heard differently.