Barbara Howitt debuted in the role of Rosina in Rossini's Il barbiere di Siviglia with the Carl Rosa Opera Company in 1948, repeating the role in 1949. Other roles performed in Scotland with various companies included Mercedes in Carmen, Kate Pinkerton in Madama Butterfly, Angelina Semos in Luigi Cherubini's The Water Carrier, Madam Wanton in The Pilgrim's Progress, the voice of the oracle and then Evadne in Walton's Troilus and Cressida, Suzuki in Madama Butterfly, Mamma Lucia in Cavalleria Rusticana, the title role in Carmen, Valencienne in Die Lustige Witwe, and Marcellina in Le nozze di Figaro. Howitt first appeared with the Covent Garden Opera Company at Covent Garden as Madam Bubble in the world premiere of Ralph Vaughan Williams's opera The Pilgrim's Progress on 26 April 1951. Other roles included the second Norn in Götterdämmerung, Mercedes in Carmen, a flower maiden in Parsifal, the governess in The Queen of Spades, a singer in Sadler's Wells production of Falla's The Three-Cornered Hat, Aninna in Strauss's Der Rosenkavalier, Giovanna in Verdi's Rigoletto, one of the genii in Mozart's Die Zauberflöte, Marcellina in Mozart's The Marriage of Figaro, the shepherd boy in Puccini's Tosca, Amelfa in Rimsky-Korsakov's The Golden Cockerel, Maddelena in Verdi's Rigoletto, Flora in Verdi's La traviata, a maid in Strauss's Elektra, Suzuki in Puccini's Madama Butterfly, Nicklaus in Offenbach's Les contes d'Hoffmann, Evadne and the Voice of the Oracle in Troilus and Cressida, Grimgerde in Wagner's Die Walküre, and Countess Hurwitz in Lehar's The Land of Smiles. Her final performance with the Royal Opera took place on 3 December 1963 where she played Aksinya in Shostakovich's Katerina Ismaillova. In all she was in 77 performances with the Royal Opera House at Covent Garden. On 10 December 1959 Howitt appeared in the musical The Demon Barber, adapted from George Dibdin Pitt's play of Sweeney Todd. She played the part of Mrs. Lovett to Roy Godfrey's portrayal of Sweeney Todd.
Critical appraisal
As Howitt played primarily secondary characters, she generally received scant mention in published reviews. Reviewing her debut as Rosina, a critic mentioned both Howitt and Gwent Lewis sang the "contour" of florid passages rather than executing them accurately. In a 1953 Covent Garden production of Carmen conducted by John Pritchard and directed by Anthony Asquith, critic Philip Hope-Wallace found all the leads wanting except for Howitt. But in a new production of Tales of Hoffmann, Eric Blom took Howitt to task for her anxiety in overplaying her role. Reviewing the premiere of Walton's opera, a critic said Howitt "successfully" took on the role of Evadne. In a 1956 revival of Rigoletto with Tito Gobbi where Howitt played Maddelena, Philip Hope-Wallace said hers was one of a handful of "minor parts from stock doing the company proud." In the recording issues of the live broadcast of Madama Butterfly from 1957, Ira Siff criticized Howitt for "tending to scoop" although he noted she had "strong scenes" with the Pinkerton and the Sharpless.
