First of all, this is a delightful listening at the holiday season - the voices (both solo & together) are well recorded, as are the period instruments. The liner notes explain the changes made explicitly - I guess this does not really upset me as much as the one other 'poor' (and unjustified) review of this recording. Baroque music is often left open to interpretation, embellishments, etc., esp. w/ borrowings from other literary sources or in the use of carols (noels). Below is another review found elsewhere which simply confirms my own thoughts - take a chance, this is still lovely music which is very well done, and at a Naxos price!
"For early music lovers, this is a delightful collection of Christmas motets and arrangements of popular French carols played on period instruments, performed with distinction by the Canadian Aradia Ensemble under the direction of Kevin Mallon. The solo singing is uniformly strong, and the recorded sound in the Church of St. Mary Magdalene, Toronto, is atmospheric but not overly reverberant. And at the Naxos bargain basement prices, this is hard to resist."