Evaluating the two masses on this program separately is almost necessary.
The second is a fairly conventional setting, although of high quality. It compares well with e.g. Ockeghem's Missa L'homme armé setting, and makes for a wonderful example of 1460s writing, especially as an example of a composer otherwise unrepresented. The performance here is also totally convincing, building on this ensemble's previous efforts and coming across clearly and with conviction.
On the other hand, the Missa Ecce Ancilla Domini is an almost unprecedented setting, unique and difficult to grasp. This mass must be seen as a significant transitional work, grappling as in parts of Ockeghem's output with a shift in cantus firmus technique. It is both the main part of the program, as well as the least clear interpretation. Issues of phrasing & intonation are not as convincing here, presented with problems by the transitional nature of the counterpoint. The relatively unexplored contrapuntal possibilities this mass presents can be evident on hearing, but then in many ways that is its chief attraction.
Ultimately, this music stands up well alongside much Dufay's or Ockeghem's work, and the interpretations confront the transitional nature of the writing instead of trying to sweep the issues under the rug. This will likely remain one of the most intriguing mid-15th century mass cycle recordings for some time. The perspective it provides is quite welcome, as is the quality of the music itself.
Todd M. McComb