Impresario Scott Siegel does what impresarios do best"which is to produce shows modest to grand with consummate ease and expertise. In this delightful outing at home base, Feinstein's/54 Below, the subject of the evening was Barbra Streisand, "the greatest-selling female vocalist in the world." This special concert leaned to the distaff, with five outstanding female vocalists, plus Tony-nominee Willy Falk, a Siegel g…
