The signal virtue of Blue Heron’s Ockeghem is that they give the music room to breathe: this has always been rare in performances of 15th-century song and it pays instant dividends. Innumerable unfamiliar details come out of these performances...A major new step in the enjoyment of 15th-century song.

All quite brilliantly done and completed by a first-class recording.

Though these works for multiple singers are thick with contrapuntal lines, and have a tinge of austere Renaissance sacred music, they are also gorgeous, sensual and nuanced, as Blue Heron’s splendid account of “Permanent vierge” demonstrates.