MICHAEL GREENHALGH talks about Purcell's Dido and Aeneas, with VICTORIA DE LOS ANGELES, JANET BAKER , KIRSTEN FLAGSTAD , TATlANA TROYANOS, and JOSEPHINE VEASEY as Dido, in performances conducted by BARBIROLLl, DAVIS, GERAINT JONES , CONSTANT LAMBERT, ANTHONY LEWIS , MACKERRAS, and CLARENCE RAYBOULD