Interesting discussion. Although KOB is often referred to as the beginning of modal Jazz and held up as an example of improvisation that is less tied to chord changes; more "free floating", if you will, it still strikes me as more structured, less amorphous, than than the recordings by the Second Great Quintet -- especially those that feature their original compositions. As in visual art or poetry, there’s a spectrum that covers a graduated span between the explicit/representational to the implicit/abstract. Each of us will, given sufficient exposure, discover what feels most stimulating/natural along the spectrum. As I’ve aged, my tolerance for atonality, absence of evident structure and more abrasive timbres has noticeably diminished (no pun intended). ;o)