Stile Antico is a 13-member a cappella choir based in London. Most of these fresh-faced singers are still in their 20s, but they've already racked up some impressive awards for their recordings -- mainly of intricately woven music from the Renaissance.

And that's just what the group has in store for us in this concert at St. Paul's Church in Cambridge, Mass. -- hand-picked sacred music for the Christmas season from the English Tudor era, by such 16th century composers as Thomas Tallis and William Byrd.