Cantor Jonathan L. Friedmann has a column on Jewish music in a blog called the Daily Rabbi. In Jonathan’s columns, he muses on various aspects of the history of Jewish music, book reviews and aspects of Jewish song. The latest one is about choral music: http://www.thedailyrabbi.com/category/jewish-music-nusach/. The blog has different topics, with links to back articles. Click on the pictures to get them.