NOCCA Vocal Students Celebrate the Dedication of Treigle Plaza in front of the Mahalia Jackson Theater for Performing Arts with Assistant Department Chair: Vocal Music Phyllis Treigle. This was held on the opening night of the opera season in conjunction with a gala concert starring Placido Domingo. Treigle Plaza was named in honor of Phyllis Treigle’s father Norman Treigle who made his operatic debut with the New Orleans Opera Association and became a world renown star and is recognized as one of the greatest opera singers of the 1900s.