PORGY & BESS -HQ/MONO-Of all Gil Evans' orchestral scores for soulmate Miles Davis, PORGY AND BESS is his richest and most ambitious a watershed of modern jazz harmony which served to secure Davis' pop star stature and define his brooding mystique. Inevitably, even non jazz listeners own a copy of PORGY AND BESS or SKETCHES OF SPAIN. Like MILES AHEAD, Evans' band on PORGY AND BESS de emphasized the traditional reed section in favor of a tuba, three French horns, two flutes