[2] Since March 1982 Trevor has been one of two regular singers in the alto section of the a cappella ensemble The Tallis Scholars.
[6] She has performed internationally with the ensemble, which has won prizes including Gramophone Awards during her tenure.
[7] The Tallis Scholars celebrated their 25th anniversary in 1998 with a tour that included concerts at New York's Church of St. Ignatius Loyola, singing music by English composers of the Tudor period (Thomas Tallis, William Byrd, and William Mundy, among others), and by continental composers such as Palestrina and Nicolas Gombert.
[5] James R. Oestreich of The New York Times noted that the group's "characteristic sound, bright, clear and balanced, has become a model for many other choirs".
[8] She subsequently was the soloist with the Rose Consort of Viols and lutenist Jacob Heringman on a 1992 recording, John Dowland's Lachrimae.