The Boston-based Blue Heron choir is one of America’s leading interpreters of Renaissance choral music, and this collection of works by the Franco-Flemish composer Guillaume Dufay — the ensemble’s debut recording — is a great introduction to their sound. It focuses on sacred and liturgical music, but also includes a handful of secular songs and a few pieces from Dufay’s contemporaries John Dunstable, Hugo de Lantins, and Johannes Ockeghem.
