Last week, we announced the beginning of Washington’s orgy of Christmas and non-specific winter holiday concerts, but that was only the tip of the iceberg. However, there are some good concerts this week that are not specifically for the holidays, and that’s where we’ll start. WE LIKE FREE: >> We have three good free concerts for you this week. On the first Tuesday of most months, the Washington Bach Consort performs a noontime cantata, at…