"Barbara Joyce Robotham"@en . "2013-07-01Z"^^ . . "1936-01-15Z"^^ . "Barbara Joyce Robotham (15 January 1936 \u2013 1 July 2013) was an English mezzo-soprano opera singer and concert soloist who later became a distinguished voice teacher at the Royal Northern College of Music."@en . "Barbara Robotham"@en . "2013Z"^^ . . . . . . "1936Z"^^ .