Here's a performance by "Libera," a boys' choir: https://www.youtube.com/watch?v=8qvMFlL62XA

Bill Douglas (choral): https://www.youtube.com/watch?v=_1OAZR4Avs0

Chris Brunelle: https://www.youtube.com/watch?v=PzL2hWurcaE

Barbara Bridge (choral): https://www.youtube.com/watch?v=ud84_FIP3R4