1. You also find British Countertenors in small all-male vocal ensembles like the King's Singers and Chanticleer in the USA.

2. Boerger’s guest Conductorships include the Rose Ensemble, the Madison Early Music Festival, the Kalamazoo Bach Festival, the Syracuse Schola Cantorum, the Chicago Children’s Choirs, the Christopher Caines Dance Company, Alarm Will Sound, and Chanticleer.