The Boston Camerata, an ensemble specializing in music from the baroque era and earlier, was founded in 1954. It was originally a performing adjunct to the musical instrument collection at the Museum of Fine Arts in Boston. Between 1969 and 2008, the group was directed by Joel Cohen, under whose leadership the group produced a number of recordings, including many albums of rather unconventional Christmas music. The first one that I obtained in 1975 (on vinyl) was called A Medieval Christmas. That album was followed over the years by six more recordings, each focusing on music from a specific era or region. One of these later recordings (1993), An American Christmas: Carols, Hymns and…