In a period in which the boundaries between musical genres are rapidly dissolving, there still exist major differences between what we still call a “jazz” band and those of other musical classifications.Perhaps the most significant of these is that longevity in a jazz ensemble will nearly always have an entirely positive effect on the music. That’s clearly a huge factor when listening to the high-caliber international quartet put together over a decade ago by the New York-based guitarist-composer Scott DuBois.