Although the music of Dufay is no stranger to CD--groups such as Pomerium, the Binchois Consort, Gothic Voices, and Orlando Consort all have devoted discs to his masses and motets--this offering by The Clerk's Group, featuring selections from an important Italian manuscript known as Bologna Q15, provides a fascinating overview of both early and later works from this illustrious 15th century French composer. The hour-long program focuses on motets and mass movements that reveal a progression in Dufay's compositional style, from the rather square motet Vasilissa, ergo gaude (the composer's "earliest datable work") to the complex rhythms and free ornamentation of O gemma, lux et speculum and the sophisticated structure and highly developed melodic/harmonic relationships of the Credo (manuscript No. 108).

If you're an early music fan, you'll be right at home with this mostly male ensemble's finely focused, reedy sound (there's one woman among the group's six members, veteran alto Lucy Ballard), and there's no letting down of energy or concentration throughout the longest phrases within individual motets or across the more extended mass movements. The closely recorded voices and overall bright sonic quality wears a bit after 15 or 20 minutes, but you can't fault the singing, which brings a vibrant, assured presence to these ancient works; and if you're looking for fine, clearly sung, stylistically conscientious performances, you really can't go wrong here.

--David Vernier, ClassicsToday.com