The single-voiced song form was actually unusual before the 17th century Italian composers began excelling at it. The collection has some gems, by Monteverdi, Frescobaldi as well as lesser known (to us) composers such as Merula, Ferrari, Strozzi, etc.
The combination of an exceptional countertenor in Lemos and the spirited accompaniment, with a few instrumental pieces scattered here and there to spell the songs, works remarkably well. Lemos has the embellishments, the delivery and the phrasing that works with the authentic period instrumental playing style to create a world that we no longer know in our contemporary world but recognize as fully worthy of our attention.
Not since Alfred Deller have I heard a countertenor with this level of musicality and spirit. And the music is superb. I can't say that more emphatically--and I have nothing to gain by saying it except perhaps to convince others of what they will get with this release, to bring them the pleasure I experience myself by listening.
By the way, as with many Sono Luminus releases this comes as a set: a CD with the stereo mixes and a Blue-ray disk with 5:1 surround sound.