In 1994, Parry was in the original London production of Cy Coleman's City of Angels at the Prince of Wales Theatre in the West End.

There, he co-founded the distinguished vocal ensemble, Dunedin Consort, and directed performances at festivals in the UK, Spain, Belgium, France and Canada.

He is director of the professional choir, London Voices,[3] who have been at the forefront of choral singing in the UK since their foundation by conductor Terry Edwards in 1973.

The choir has performed on the soundtracks of major films, including "The Hobbit", The Lord of the Rings, Star Wars, the Harry Potter series, Spectre, Aladdin and Jurassic World.

The choir has performed and recorded with major artists, including Paul McCartney, Sting (musician), Sam Smith, Gary Barlow, Jacob Collier, Florence Welch, Dave Brubeck, Bryn Terfel, Angela Gheorghiu and Renée Fleming.

[1] In 2016 he appointed a new chief executive, Anne Besford, to run the organisation, retaining the roles of artistic director and principal conductor.