[5] In a similar year, she won the Concert Artists Guild of America Amcon Award, [6][7] following which she gave her New York debut at Carnegie Hall and toured the United States.
[10] In 1988, Mackay starred in Sadler's Wells Opera Company's four-month West End run and UK tour of Noël Coward's Bitter Sweet (the first professional revival since its 1929 premiere).
[11] In 1990, Mackay toured France, Italy, Spain, and the UK with the European Community Chamber Orchestra as their Guest Singer of the Year[3] In 1992, the Worshipful Company of Musicians elected Mackay a John Clementi Fellow, one of their most prestigious awards for a "professional musician of outstanding ability"[12] for her study of the music of George Frideric Handel.
[16] Mackay has recorded for the RPO, Decca, Erato, ASV, Meridian, and other companies, including, for Decca, Dixit Dominus (Handel) with the English Chamber Orchestra and the Choir of King's College, Cambridge conducted by Stephen Cleobury, for RPO Records Paul Patterson's Mass of the Sea with the Royal Philharmonic Orchestra conducted by Geoffrey Simon, for Erato Jean-Philippe Rameau's opera Naïs with the English Bach Festival Singers and English Bach Festival Baroque Orchestra conducted by Nicholas McGegan and, for ASV, an album of Handel with the European Community Chamber Orchestra conducted by Eivind Aadland.
[17] Other recordings include a series, for Meridian, with the English Piano Trio of Scottish folk song arrangements by Haydn and Beethoven.