Shirley Horn at the 4 Queens

If you were a female jazz vocalist who began your recording career in 1959 or later, you were almost certainly in trouble. Not only were you entering space already crowded with band veterans such as Ella Fitzgerald, Sarah Vaughan, Dinah Washington, Peggy Lee, June Christy, Carmen McRae, Julie London and Jo Stafford but you also were going up against a c…